Seriously though, I thought about leaving them loose, but am afraid I won't be able to get them in place once the bands are on.
I've got them set so they are just barely below the top of the lams, so I should be able to tell if the lams hang up.
Also center line is marked on form, riser and back lams. Back lams are doweled to the riser. Also have stops on top of riser and lam ends with about 1/16-1/8" of play.