Did exactly what you want to do on my H-27.
I got marine grade aliminum plates from the welding shop around the corner.
I made an aluminum plate the size of the small bump up upon which the mast shoe fitting was fixed. (The mast shoe is the oval base screwed to the deck upon which the base of the mast sits). I then made another plate about 5 inches wider than the width of the mast shoe. I drilled a 1" hole in each corner of this plate. And then bent the ends of this smaller plate up in a vice. The result was a plate that was bent almost like a "U" with a hole in each corner for a turning block.
I removed the mast shoe.
I then put the larger flat plate on the deck in place held it with some 2 sided tape and drilled up from the cabin through the existing bolt holes. (PS my shoe was held in with only 3 screws too,) then put the 2nd plate on top with the bent flaps up and drilled through this second plate. This was all the holes line up with the holes in the deck and the holes in the bottom of the mast shoe. In the end I wound up adjusting the holes in the plate a little with a round file. I had one of my sons put a block of wood on top of the plates while I drilled in case the tape did not hold while I drilled. The wood block was to protect the feet. (Did not want to ihave to make a trip to the Hospital !!!!)
Once everyting was lined up I removed the tape and using a little expoy slurry made a paste and epoxied the larger plate to the deck. I then used langer screws and screwed it all back together. Mast Shoe, "U" shaped plate, Larger Plate back onto the deck.
'When I was done I hade a lace for 4 turning blocks at the base of the mast.
If you wanted to go all out I guess you could weld the two plates together but I thought that was a little overkill. I also drilled some holes in the bottom plate for the VHF and mast light cables.
I going out to the boat tomorrow to put the winter cover on. E-mail me at
Nelsonhow@netscape.net if you want a pic of the final result and I'll send you a pick.
it to you.
HN