The
mast support on the B27 depends on the
interior layout. The dinette model uses the "Bristol" style of
mast support (also used on the B29, B30 and some other first gen models) that employs the
head door frame as an arch support for the mast. The B27
cabin style that has opposing seatees uses the "Pearson" style of a support arch built into the the underside of the cabintop and using the two forward (head and hanging locker) bulkheads for vertical support. This arch style was common in early Pearsons including the Triton. Whichever style you have, if your mast is similar to the B29's mast it has an open masthead, allowing rain
water to run down the inside of the mast and eventually
rot the support system. You should also inspect under the
cabin sole where the mast supports (either style) tie into the floors of the
keel. The movement is coming from one or the other area.
Good luck
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