Originally Posted by texasliam
Looks like you did the exact job I'm thinking about. Where did you get the aluminum riser? I'm betting the the riser would corrode in time. Galvanic reaction with the iron plate. What do you think about adding a zink to the riser? Any other pictures or info you have would be great. I'll pm you my adddress.
I answered your Pm before I read your post here....So sorry for not understanding your question.
1) I did not use Aluminum...I used SS
2) I Isolated my Aluminum mast form the SS base plate with 1/8" of UHMW ( I referred to it as HDPE but that's Excavator pipe talk )
3) No galvanic corrosion! as there is no metal to metal contact....even my pin SS mast to shoe anchor
pin is isolated with UHMW bushings.
4) As far as building up your mast step the 2" you need to replace cutting off your mast ...you could do something out of fiberglass like this pictured below.... My mast cant sit in bilge water
as it is elevated above it on a solid fiberglass platform built up off the keel
trunk....my new mast base plate ( Shoe) fits right on top of this base and is through bolted onto it.