A couple of the turning blocks at the base of the mast on our 1991 Legend 37.5 are attached with a spring/bolt device. The spring holds the block up. The block (or spring) appears to be attached to a bolt that slides into a hole on the mast base. There is also a slot on the mast base where a nut can be inserted to attach to the bolt to fix the entire assemply to the mast base. I am working from a photo I took last year and cannot quite see everything. I am re-rigging the boom and need to purchase a couple of these blocks with the spring- bolt device. Does anyone know where I can purchase these?