Mast step plate
Rob, I think that the plate that Mike is asking about, is an optional utility plate with holes in it for connecting sheaves, boom vang or Cunningham to. The lower mast hinge plate sits on top of this utility plate. I think that the plate is the way to go for Mike's 26, where he wants to have his halyards run back to the cockpit. The less drilling that he would have to do on top of his cabin, the better. The only thing I'd like to pass on to Mike is; Use a good grade of boat caulking like Boat-Life Boat Caulking, and coat the bolts with the caulking, where it goes through the plates and cabin. Last year I had a small leak coming from one of my mast bolts, and I had to take my mast down and take the bolts loose so that I could caulk them. I knew which bolt was leaking because I sat in the cabin during a heavy rain storm. The bolt never leaked until the storm ended. Then I could see drops forming at the end of one of the bolts, which brought me to the conclusion that the bolt hole had filled up with water and it had to go somewhere, so it came out right around the threads of the bolt under the nut. After applying the caulking, It's always a good idea to have someone hold the head of the bolts with a wrench so that they don't turn, and just snug the nuts up, and let it sit and set up for a day or so. Then come back and re-tighten the nuts, being careful not to let the bolts turn. I know that there's probably better stuff out there like 3M caulking, but in any case, I'd stay away from Silicone for this job.