Quote Originally Posted by Duniek View Post
project
instead 4mm I drill 2,9mm hole


and 2,3mm chaneles and 1,7mm gaps
Make the bottom about 1 mm thinner to make it do a little better And at the top, make it bit smaller on drill size and just nick it with suction tube OD size so you can push it in without having to worry about blocking suction return...
This one really brings me back old memories lol.