The tools needed to install the mechanism that I am assuming you have available
are a table saw, drill press, and router installed in a router table. You
will also need some c-clamps and other hand tools. Before installing the
mechanism you will need to make two jigs to assist you in the process.
One is a simple guage that will allow you to route the correct length hole
and the other is a line release hole alignment jig - used in aligning the line release
slot in the wooden stock.
Construction of the Mechanism Slot Guage
On the table saw adjust the fence so that the distance between the fence
and the blade is exactly the length of the mechanism.
Using the half inch drill as a spacer take a piece of wood and using the
T-slot guide cut a block of wood that is exactly one half inch shorter
than the mechanism.
Construction of the Mechanism Line Release Hole Alignment Jig.
On the table saw adjust the fence so that the distance between the
fence and the blade is exactly the length of the mechanism plus a spacer
block.
Using the same spacer block and with the T-slot guide cut a block
of wood which is as wide as the mechanism is long.
Use a 3/16 in drill and with the block cut in the step above and using the mechanism
as a guide - on the drill press drill a hole on each end of line release slot into the wood block.
Cutting the Mechanism Slot into the gun.
On the drill press align the quill to be in the center of the track
and clamp a wooden block on each side of the gun block to keep it centered.
Use a 1/2 in drill and drill a 1/2 in hole to a depth of 1.5 to 1.6 inches.
With the drill still in the hole , use the mechanism slot guage you
constructed as a spacer and clamp a stop block to the table of the drill
press.
Slide the block back till it hits the stop block and drill a second
hole 1.5 inches deep. Now these two hole form the ends of the slot the
mechanism will go into.
Put a 1/4 in drill into the chuck and with the drill all the way
to edge of the rear 1/2 in hole - drill completely thru the gun block.
Move the block rearward about 3/4 in and drill another hole in the
center of the block all the way thru - these two 1/4 holes will guide the
thru hole for the trigger.
Put a 1/2 in long fluted cutter (an aluminum milling bit works great
here) in the router and adjust its height to be the same as the mechanism.
Put the rear hole in the mechanism slot of the gun block over this
bit and clamp 2 alignment blocks to the router table - one on each side
of the gun block.
As in step 3 - again use the mechanism slot guage to put a stop block
on the router table to limit the length of the slot you are about to route.
. Turn the router on and push the block to the stop block.
Now place a 1/4 in long router bit in the router and adjust the height
of the bit so that it will just come into the pocket you created in step
11 from the holes you created in steps 5 and 6 above.
Again capture the block with side guides as in step 8 above and route
between the two 1/4 in holes - extend this trigger thru slot approx 1/4
in rearward of the end of the mechanism slot.
Pinning the mechanism to the block.
Push the mechanism into its slot until the depth is adjusted so a
shaft will properly engage and release when the trigger is pulled.
Using a square draw a line perpedicular to the track in the gun and on the front
edge of the mechanism. Draw a similiar line but with respect to the rear edge of the mechanism.
Using the drill press and a 3/16 inch drill - approximately 1 inch from the top
of the mechanism and on the lines drawn in the step above - drill thru the block and mechanism.
this should leave a 'half moon' cut out in the mechanism on both ends of it which when pins are
placed in the holes will lock it in place. If you were slopping in cutting the slot - use hot melt
glue or superglue to hold it in place while accomplishing this step. If done properly - the mechanism
will be tight in its slot and this wont be required.
Use the line release jig now - align between the mark and with the top aligned
with the top of the mechanism - mark the end of the line release slot.
Remove the mechanism from the block.
Using a 5/32 in drill drill the two end hole for the line release
slot.
Drill either a sequence of holes on the drill press or use your router
to open the line release slot into a slot - finish with a narrow flat file.
Drill and tap a 6 x 32 threaded hole 1/4 in out from the edge of
the mechanism and in the center of the line release slot.
