Reply To: What kind of bolt is used for putting on weights?

[patrick j slattery]

I use 5/16 bolts that are rounded but have a screwdriver slot and fully threaded.  You can get them at most hardware stores.  Use a large fender washer for the inside of the seat, and a washer and two nuts on the other side.

I dont like  carriage bolt, they are sometimes hard to get really snugged up because there is nothing to hold the bolt still while tightening, and they also put a bigger hole in the seat which i try to avoid