[frizzen]

Thanks jerry, i'd wanted to come up with something overly complex, probably having little pivots that would get dirty and jam. Then i noticed some 1/10 crawler accessory chain still on the bench. I thought this way might be more durable, and able to self-clean better.

I'm sure that somewhere there's info on determining chain lengths and angles to maximize leverage against the weight on doors, so i just didn't go looking for any of that.