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Old 07-26-2017, 08:31 PM   #1 (permalink)
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Anyone know of a guide or have some tips?

Drilling a hole is pretty straightforward. What size bit?

And as stupid as it sounds what kind of bolt do I put through the hole?
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Old 07-27-2017, 12:51 AM   #2 (permalink)
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Use whatever size bit you like really.. and use a internal hex bit screw as seen here, can be found at just about any hardware store..
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Old 07-27-2017, 08:30 AM   #3 (permalink)
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I like using 5/16-18.

Drill a hole using a letter J drill bit. Tap with a 5/16-18 tap. Buy a 5/16-18 set screw (either cup or flat point) with a length of 3/8 to 1/2in.

Then take an old nail that fits inside the ID of the spring cut it down to about 1/2 with the head still on it and use that as a spring guide.
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Old 07-27-2017, 10:18 AM   #4 (permalink)
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I use 3/8-24. It allows the spring to be replaced without opening the marker up. Just back out the velocity adjuster, swap springs and reinstall the adjuster.

The other nice part is the existing depression in the back cap will act as a guide for the bit, making it easier to drill the hole in the correct spot.

Google "tap drill chart"


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