"Handles" referring to the whole scissors-like assembly in this case. The wooden gripping area isn't a drama.
Did have a self-induced defugalty drilling the attaching holes for the four cavity mould. The Lyman sprue cutting plate has a secondary lock at the opposite end which can bind the blocks if not out of the way altogether when closing. So when holding the handles shut on the blocks with shims at the bottom of the grooves during the drilling operation, the holes were generated at a slight angle. After pins were installed the mould would tend to remain slightly open at the top! Took a while to figure out the cause, but it was not to hard to correct the problem after much head scratching. "Murphy" must like bullet casters...