"Garland Gray" wrote in message
...
Frankly, I thought I'd get a better answer here.
It's really moot now, because I have a choice of GFN for only one size
sheave(I need 3 different sheaves) . I'll probably get it and try it
because the size might be better than the closest acetal sheave.


My most humble apologies for not being able to give you the answer you
sought.

Seriously, this is one of those, "You pays your money, you takes your
chances," sort of decisions that nobody else can really make for you. I
thought the suggestion from someone else to talk to your rigger about it was
spot on. For my own part, I don't like putting plastic parts anyplace where
I can't inspect them on a regular basis, and would always choose metal
sheaves if at all possible.