Using some 3-1/2” bolts to glue up two boards at a time. It is easier to keep everything square and straight this way. Also there’s no rush just gluing two boards together.
The holes are 5/8” so that when I get ready to glue up the 6 sets of paired laminations, I can use the 3/8’ threaded rod – hopefully the holes line up well enough.
-- Rodney, Arkansas