The bodyman stopped by the house yesterday to rivet the shaker flange to the dome. It's a two-man job as one person has to hold the upside-down dome with the rivet inserted, tightly against the flanging "chisel" which has a cupped section that holds the rivet head in place. The cupped chisel is set in a vise, with the shaker and rivet placed on top. The bottom of the rivet is then peened over with a flat ended chisel to permanently set the rivet.
Worked out well, all thirteen rivets went in without any damage to the fibreglass. (NORWOOD, thanks for the rivets, BTW)
Now I have to find another car to set under the shaker. Hmmmmmm.