I just got two nice new solid-surface cast-iron table saw extensions to replace the webbed ones that came with my old Craftsman table saw.
The old webbed extensions had holes on either end but the new ones have holes on only one end.
I would like to still use the old webbed extensions to further extend the new extensions but to do so it seems like I would need to drill
4 oversize 5/16" screw holes (oversized to allow fine adjustment) to line up with the holes on the webbed extension.The holes would have to go throuh about 3/8" of cast iron.
How hard would it be to drill such holes? - Any special bits? - Or should I take this to a machine shop or something to get it done?