Rvjimd-If you are thinking of another project I guess you are hooked on this great hobby
. But I'm sorry to say I know nothing about clamshell buckets or rigging. There is a guy on here that goes by "eef" who has an amazing clam shell crane and bucket and he seems to know how and why everything works. I am sure he would answer your questions. Here is a link to his build-
http://www.rctruckandconstruction.co...ead.php?t=1619
A few pages in there are some good pictures of his clamshell bucket.