Sorry - still thinking about your chain problem! When you say "snapped", do you mean that literally or were the links not welded and pulled apart?
The reason for asking is that for the steering gear on my puffer, I looked at several samples of brass chain with brazed links but, because of mishapen links, felt it would not run freely over the sheaves. In the end I bought some silver chain from a jewellers supplier (not as expensive as it sounds!) which works well and, for its size, is pretty strong (having survived an incident when the servo tried to pull it beyond its limit).
Mike