Ok, finally getting around to this project and have run into a bit of a snag. (not surprising - it IS a boat project
Normally the block has a 1/2 inch diameter threaded stud that inserts thru the mounting hole in the collar and meets with a nut slid in through the slot at the bottom of the collar.
Mine however has a sleeve inserted through the collar from below. This sleeve is "capped" on the end with what appears to be a nut and the inside of the sleeve is threaded for an M8 metric stud.
The problem is I can't find any blocks set up in this manner. I've tried Harken, Garhauer, USSpar, Charleston Spar and Rig Rite. No one carries anything like what I need, most have never heard of such a thing.
My question, how big of a deal is it to slide the deck collar up the mast a bit? From looking at it there are 4 bolts holding it to the cabin top. I'm assuming it is tied into the mast to counter the "pull" from the lines that run through the blocks. Thoughts? Warnings? I've got a rigger coming in a couple of weeks (local yacht club brings a couple guys up from Seattle each year) so I'll have professional help doing this.
Here's a couple photos showing the sleeve and block attachment:
Thanks in advance!