They are suggesting you countersink the holes on the back. That is what the csk is an abbreviation for. I have never done it on scores of bodies I've made. The neck plate holes have the countersink on it. I will sometimes clean up any splinters from drilling with a hobby knife.
The other part of that is that you do drill 4 holes through into scrap wood to minimize split out. Most here use a drill bit one size larger than the screws they are using so that the screws just drop through.
This is the screw I usually use.
Neck plate screws (4 pcs.), phillips head, #8 x 1-3/4" which has a .164" diameter.
Stewmac recommends a 3/16 hole in the body, I will usually do a 9/64 or 5/32" hole myself.
The other part of that is that you do drill 4 holes through into scrap wood to minimize split out. Most here use a drill bit one size larger than the screws they are using so that the screws just drop through.
This is the screw I usually use.
Neck plate screws (4 pcs.), phillips head, #8 x 1-3/4" which has a .164" diameter.
Stewmac recommends a 3/16 hole in the body, I will usually do a 9/64 or 5/32" hole myself.
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