[THE GITS]

Out trigger mechanism has a square back so we must square off the back of our recess. To do this use a 12mm bevelled edge chisel, mine is getting impossibly short but still works like a dream. Make sure the chisel is very sharp then very carefully starting at the wide end pare down the waste using the back of the chisel as a rest to support the cut. Eventually you will be left with a remnant of the router cut running as a thin line for the whole height of the recess, stop here.

We must now turn our attention to the trigger itself. We need to cut a hole on the underside of the gun to allow it to fit into the recess. Fit the shaft into the mechanism, place the mechanism on the gun in exact alignment of the recess. Now with a pencil mark the front most position of the trigger and a little more. Now pull the trigger until the sear releases, mark the rearmost position of the trigger and a little bit more. Using a square, mark these positions on the underside of the gun. Turn the blank over and using the 12mm cutter remove the wood between these marks.

Now reassemble the parts into the gun and test them.