Hello Steve,
If number 2756 is the number on the mast ring it's correct to use it for the sail.
About the issue "the lower gudgeon backing block is a bit soft": Chances are the upper block is cheese as well, actually the original "blocks" are creditcard-sized 15mm(?) plywood, now long deprived of any structural rigidity.
The gudgeons take a relative amount of stress and the attachment failing during sailing is a classic Minisail Monaco failure.
On two Monaco's I have reinforced the transom gudgeon area by:
- cutting out a portion of the bottomsheet of the hull (about 50 by 60mm), taking the lower gudgeon support out.
- cleaning the inside of original debris backing material.
- inserting a wooden block snugly fitting the upper and lower decksheet.
- Glue (I use epoxy) the cutout back on watertight and screw the gudgeons on in fresh wood.
The procedure is of the same complexity -or simplicity- as going ahead and saw a hatch hole, only it doesn't leave a scar on the deck nor the need of a hatch. After all you don't need a hatch, there is no need for accessing the area once the repair is done. More so, hatches leak, they all do. Especially our foam-filled Minisails can do without extra water intake.
The same goes for the repair you intend to do on the cental area of the hull, try to avoid relying on hatches to finish the repair would be my advice.
Hope to see you in Bowmoor,
Greetings,
Ronny