I've got the prototype trigger mechanism almost finished.
It's basically the standard 2 part mechanism, a rotating nut and a trigger. The juxtaposition of the two parts is such that the trigger protrudes horizontally from the back. The entire mechanism will slide back along the stock of the shooting machine between two rails. As it draws back to the desired draw length, the trigger will lift on a sloping peg inserted into the stock giving an automatic loose.
Alternatively the mechanism can be clamped in a fixed position, the string drawn onto it and the the trigger manually lifted to loose.
The nut and trigger are made of plywood and will only probably be only strong enough for light bows. Of course plywood is no good for the working parts so these have been faced with bits of hacksaw blade epoxied into place.
I've made the fingers of the nut approximate to an archer's fingers, and being wood, I can easilly shape them as needed. The final version will have aluminium fingers and a steel centre section and trigger.
The sheet steel sides of the mechanism are held apart by two aluminium spacers with 3mm steel rivets going through the whole assembly.
Hopefully I'll get the rails built soon and try it out, mind I have mince pies and sausage rolls to make too!
Soon be time for my round up of the year, but it would be nice to get this done before then. Hoping for some Hazel harvesting over the holiday too, good excuse to get out of the house and have a pint with some chums.