That happened to mine years ago.
Down in the S.F. Bay Area, I believe on Alameda Isl. there was/is a guy by
the name of Duesenburg; a hot shot repair guy. He put in an inspection port
next to the centerboard hole, wrapped the mast tube and reinforced the mast
step. I have not had any more problems since then and the port (with port
bag) makes a GREAT place to put sandwich, drink, keys and wallet !
It all is a relatively easy fix IF YOU GO TO THE RIGHT PERSON/PLACE.
Matt; Laser: Set on Stun

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I have a laser 1 that has broken on the deck around the mast entry point.
The cracks go right through the deck and there are 4 of them radiating in
all directions, the worst being about 7 inches long. The tube that the
mast sits in has seperated.
Best methods of repair please!!