Drill & Tap for Williams FP-94/36 - not that hard or costly

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AJMD429
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Drill & Tap for Williams FP-94/36 - not that hard or costly

#1 Post by AJMD429 » Sat Mar 06, 2010 6:25 pm

Several folks have recently inquired about sight installation, and I thought I'd post some pics about mounting the Williams FP 94/36. If I can do it, anyone can. Anyway, hope this helps get someone started who needed a bit of encouragement.

Here's all you need: Tap is 6-48, and drill is supposed to be a #31, but I used a slightly smaller #33. I like the 'straight-flute' carbide ones. (...the 'guide' I have says use #33 for a 6-48 but #31 for a 6-40...?). I got Tap Magic at the Ace Hardware in town. A good center-punch is a must, and drill press.

Here's the specific parts I ordered from MidwayUSA:
I may have done overkill on the drill bit, but it cuts through gun receivers like they're butter. Also, I wound up liking a tap handle I bought locally a bit better (deeper divet in the top for guiding on drill press).

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The sight needs to be far enough rearward that the case will eject; a bit behind the boltface's rearmost travel seems to work fine. If you haven't deactivated the semi-safety, you shouldn't cover it up.

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Drill the first hole.

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Then TAP the first hole. I like using a piece of rod or bolt that fits in the top end of the tap handle, and have the drill press 'guide' (no pressure downward) the tap as I turn it by hand, backing up a partial turn for every turn or so clockwise. Use lots of Tap Magic; it does seem to make a difference vs. 'WD-40'. I tap clear through and when the tap turns very easily you're done and can raise the chuck and back the tap out.

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Countersink the holes very slightly or otherwise de-burr them.

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Mount the sight with the first screw, and level it front to back before center-punching the second hole. Ideally your punch should be 'snug' enough in the sight's hole to be centered; 'eyeballing' it is too tricky. Some folks use a smaller drill bit just fitting the sight hole, or they will slip a very small bit inside a 'bearing' sleeve of tubing that fits the sight hole, and use the drill to 'mark' the second hole and start it at the same time.

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Drill the Second hole, then tap it as above.

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Both holes drilled now.

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Put it all back together. (You might want NKJ's DVD for this part...)

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Oh yeah - last step. . . Go shootin'. . . !!!
Last edited by AJMD429 on Thu Sep 01, 2011 9:14 pm, edited 8 times in total.
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Chuck 100 yd
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Re: Mounting the Williams FP-94/36 - pics to follow...

#2 Post by Chuck 100 yd » Sat Mar 06, 2010 6:43 pm

Yup, That`s the way I do it to. :D

More pics on the Drill and tap thread by Shooter.

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Re: Mounting the Williams FP-94/36 - not that hard or costly

#3 Post by shooter » Sat Mar 06, 2010 9:30 pm

Thanks for the post, AJMD. It looks doable, and I would probably attempt it if I were working on my gun. Unfortunately, it's my friend that is inquiring about installing the sight, as I already have several. He's terrified of working on his own guns, and I'm terrified of working on his guns too. I will work on mine all day long, but there are some things I won't do for my buddies because I don't have the money to replace their guns if I mess something up. I mess up my gun, I cuss myself, and have to wait till I save up the money to buy another. I mess up my friends' guns, and they are upset with me, plus it's not fair for them to have to wait a long time on a replacement.
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Re: Mounting the Williams FP-94/36 - not that hard or costly

#4 Post by J Miller » Sat Mar 06, 2010 9:32 pm

Thanks AJ. Another "how to" thread in my bookmarks. Now all I need is all the tools you used and I'm in business.

Joe
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Re: Mounting the Williams FP-94/36 - not that hard or costly

#5 Post by Wind » Sat Mar 06, 2010 10:14 pm

Hey there AJ -- Nice job for sure. Here is a tool that will make your collective lives a lot easier. It is called a Vix-Bit and is a self-centering pilot hole starter. It has a sliding outer sleeve with a tapered tip. Put it over you guide hole (sight, hinge, etc.) and push. It can just locate, or drill the complete hole, and they come in various sizes. Hope this helps. Best regards. Wind
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Re: Mounting the Williams FP-94/36 - not that hard or costly

#6 Post by J Miller » Sun Mar 07, 2010 12:23 am

Wind,

Those look pretty neat. Where do you get them?

Joe
***Be sneaky, get closer, bust the cap on him when you can put the ball where it counts ;) .***

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Re: Mounting the Williams FP-94/36 - not that hard or costly

#7 Post by Wind » Sun Mar 07, 2010 8:38 am

Hey Joe - This outfit has some good stuff, as well as Vix Bits. You and you credit card are on your own... Best regards. Wind

http://www.garrettwade.com/product.asp? ... 1267968747

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Re: Mounting the Williams FP-94/36 - not that hard or costly

#8 Post by Roland » Sat Jul 02, 2011 3:07 pm

Sorry to bring up this old topic but I was wondering, if you don't have the rear safety (my rossi came without one) then there is no reason I couldn't mount the sight farther backwards right?

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Re: Mounting the Williams FP-94/36 - not that hard or costly

#9 Post by J Miller » Sat Jul 02, 2011 3:33 pm

Roland wrote:Sorry to bring up this old topic but I was wondering, if you don't have the rear safety (my rossi came without one) then there is no reason I couldn't mount the sight farther backwards right?
Roland,
The normal sight location would put the sight right over the safety lever. This would interfere with the safety and prevent the sight from going all the way down. So that necessitates moving the sight forward.
Without the safety there's no reason not to mount it all the way back.

Joe
***Be sneaky, get closer, bust the cap on him when you can put the ball where it counts ;) .***

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Re: Mounting the Williams FP-94/36 - not that hard or costly

#10 Post by AJMD429 » Sat Jul 02, 2011 9:48 pm

Yep. Joe's right. Just make sure there's enough 'thumb' room to cock or de-cock the hammer manually without hitting the aperture, if it is screwed in.
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Re: Mounting the Williams FP-94/36 - not that hard or costly

#11 Post by JerryB » Sat Jul 02, 2011 10:38 pm

Thanks Doc, real good instructions.
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