I have tried loose and tight fits in the past, and I prefer loose fits on 3/4 pine and tighter fits on 1/2" I use either a #3 or #5 FD blade, which I find works great, also on1/4" I find Puzzle blades work great. But always make sure that the table is level or you will have a hard time removing the pieces. Thanks for the survey, as it will help people in doing puzzles. Edward