Probably a stupid question but if I don't ask---guess I would be stupid since I am not sure. I bought a fillet knife kit with 5 holes for pins. They sent me 3 pins so I assume, I am to use only 3 pins. Probably a matter of preference as to which holes to use but am wondering if there are specific holes, other than the middle one, that should be used. The others are 2 on each end, one nearer the middle than the other. Thanks for putting up with me!