Join Date: Aug 2008
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On my C27, there are 2 sheaves (pulleys) at the top of the mast: one for the main, one for the jib). One of them disintegrated when I went up the stick to change the anchor light bulb. This might have happened, or your halyard might have jumped the sheave.
Only way you can be sure is to go up and check. And I wouldn't want to do it alone.
There are lots of ways to get up (chairs, webbing ladders, etc.) - and none of them are easy. I had a buddy hoist me up in my climbing harness - which gets real uncomfortable after about 20 minutes.