No problem, as typical single backstay tension is only 10-15% of breaking
strength (probably 4000 to 8000 lbs), provided the rigging and its
connections haven't been compromised. You might want to inspect first, if
you haven't done so recently. Obviously this is way more important that the
flag halyard block.

A snatch block on the backstay used to hold your chair close, rather than
wrapping the main haylard,.would reduce possible complications.
Len

--
Eliminate "ns" for email address.

I have a block for a flag halyard connected to my backstay about 15
feet above my deck. The block has failed, and I'd rather not unstep
that mast to replace the block.

Can I used a bosun's chair and connect the main halyard around the
backstay to lift someone up to the fitting to replace it?


My main concern is placing 180 to 200 pounds of strain on the backstay.
Logic tells me this is okay though, since the forestay carries the
genoa, but before I try, I'd like other opinions.

Thanks!