Help needed building an onager

[Robert]

Nice picture! I do wonder about the technecalities of it all, though. The drum where the cord is would is very thin, but this is were a large force is excerted, that and the fact that for each full rotation, very little rope is wound for the effort taken.

Randi, you spoke earlier of using a wooden washer. Is there a picture or drawing somewhere of what this could look like and how it would work in an onager?

Off to the shipyard now to check for logs.