When I bought my DS1 last year, the mast hole was cracked (actually broken). I don't race, and a little wary of glass, so I sanded down the collar flush with the cuddy top, and mounted 2 plates, one on top and bottom, with SS bolts to hold in place. The plates had a hole cut through them of the profile of the mast. Works like a charm. I used plastic "cutting boards" for the plates.
Steven (itrecruit-at-netzero.net)