I do not know if the bolts are backed. I assumed the holes in the mast were threaded and the bolts simply screwed in. Don't see how they could be backed without unstepping the mast. You make a good point. The company doing the dodger is called JSI The Marine Supply Store for boat parts, hardware and sailing equipment in Tampa Bay.
. They are a complete rigging outfit, sails, canvas, spars etc. I am meeting with someone from their rigging shop tomorrow at the boat to discuss options. And, absolutely no greenhouse. I appreciate the lines of my boat.