HOW TO PIN YOUR GRIP(Or how I do it) Lots of pictures
First you want a nice, clean, open work area like this
(I KEED, I actually had to do this on a bench outside)
I was going to just do a little demo with some scrap, but then I got to thinking and next thing you know:
My scrap:
You want to cut your scales out a little over size because you are going to shape them back to the tang. Mark them left and right.
Now take the steel rod you have chosen to use as a pin (This is 5/16ths) and measure it with a caliper, because the size on the label is nominal.
This piece measured slightly over 5/16 and I picked the first drill undersize of my measurement(Which turned out to be 21/64).
Be sure to pin punch your center so the drill will not walk off point
After you drill out the holes chamfer them slightly. You can do this with a larger drill bit, a file or a counter sink(pictured)
Now we come to why you have your scales marked left and right. You want to clamp the left scale to the right side(or right scale to left side) of the tang and drill thru holes in the tang. This will give you a nice clean hole facing out and leave the rough punch thru facing the tang, when you install them. Repeat for the other side. I use a drill press for all the other holes but this is easier to do with a hand drill. Use the same bit you drilled the tang with.
Measure the width of the tang and both scales then cut the rod a little wider( 1mm+) You want to be sure and have a little hanging out of either side of the grip, so err on the wide side.
Check the clearance of the pin thru the tang, if you can push it thru with your fingers, use a pin punch to shrink the hole, like this:
Finally we are ready to put the scales on. Drive the pins thru one of the scales part way. Apply some epoxy to one side of the tang(The side for the scale you put the pins in) and put the scale on. Drive the pins thru the tang far enough that you can line up the other scale. Now epoxy this side and tap the scale on. Clamp it together and make sure there is some pin sticking out on either side.
Clamp the heck out of it and go look at RPF for a little while,
Remove the clamps and peen over the pins. Peening is using the ball end of a hammer(Not a claw hammer) to expand the pins making a tighter fit. It will look like this:
Now use a flat file to smooth the pin to flush with the scale
Finish your scales with a wood file and sand paper. Then stain and/or cover them. Ta-Da.