Hi SpearGuy, if you look at my post
http://forums.deeperblue.net/showthread.php?t=62817
there are some photos and a schematic of my trigger mech. It is by far the easiest/simplist to make and understand. Suprisingly it is really light and quiet to shoot as well. I am using a 17mm band on a 90cm barrel and this is more than strong enough. The diagram of the trigger is not the dimensions used- the actual spear has a 6mm notch, and the coresponding trigger catch is 5mm long. The metal is 5mm thick so it has a fair amount of material there for strength. It doesnt release the line, but you can add on a small catch underneath as on many production guns- less to go wrong or clog with sand!
Hope this helps.
Ross.
