Check this link out..... Scroll down the page a bit.
The Complete Refit of Trim -Part VI | S/V Trim
I need to refinish my mast in the next couple of years, this is the way i've seen the local "experts" do it with excellent results with rigs like yours.
Don't know about applying heat to remove corroded in fastners though - you would have to be really careful not to affect the temper of the alloy. Is the way to do it?
I need to remove an unused exit box and the PO did not an anti-corrosive compound (eg duralac) and the machine screws will not budge - I'm afraid I'll shear the head off if I apply too much pressure.