The zoom is not so good, I could only get close enough before focusing went to crap. Also
the illumination conditons were not what you call "ideal", but you'll probably get the idea.
RadioShack carries the microswitch, the part number is 275-016A. The screws I used are
7/64 x 1/4 thin threaded.
The screws needed cannot be wider than the switch itelf. The screws will be screwed directly
into the microswitch without using nuts. Using screws with nuts will end up not fitting by
getting in the way of the sear sping. The microswitch is soft enough to screw directly thru
it if you get the right screws. I used 7/64 x 1/4 fine threaded. Metric sizes should also work.
What you wana do Is cut a rectangular piece out of very thin sheetmetal, almost the size of a
pps rubber grip. The microswitch will be screwed directly to this piece and have the
rubber gip conceal it underneath when mounted. You will use the same rubber grip screws
to mount it to the frame.
Don't know specifically what kind of sheetmetal I used because I had some leftover pieces
around, but it is pretty thin (around 0.5mm or less).
Here are the dimensions on mine if you want to use them.
If you want to take the dimensions yourself, here is a quick overview of how I did it.
Make a blueprint of the mount piece out of clear plastic by cutting out out a rectangular piece
of plastic the size of a pps rubber grip. I used plastic out of a stabilizer package.
Place the plastic piece over the grip and mark down where the grip panel holes are. Take the
plastic out of the frame and tap both of the holes in it using a thin phillips screw driver or
a small tap.
Once the holes are done, align the plastic mount with the grip panel holes and place the
microswitch on it. Look thru the plastic and move the microwsitch until you get a good angle
of the switch lever aligned with the trigger rod retainer and screw.
Once you get this down, mark down on the plastic where the two holes of the microswitch are and
tap them like you did for the grip panel holes.
The mount blueprint is set. Using sheetmetal scissors, cut a copy of the plastic out of
sheetmetal. Drill the holes using a 1/8 drill bit, go VERY SLOW or you will tear down the sheetmetal.
It should look like the first picture on the page. If you find the screw to tight when screwing
it in the hole, use a 9/64 drill bit ONLY for the microswitch holes.
Cut two pieces of 22 gauge connecting wire and solder them down to switch contacts. Watch
out for the contacts I selected and the orentation of the connections. It is essentially that you
solder it exactly this way, if you dont, the microswitch might not fit in when installing it in the
frame.
Watch how the last contact pin is slightly bent for the switch to fit properly. Don't apply to
much force or you'll ruin the microswitch by riping out the contact. Go very slowly adding very
little force and it will bend down smoothly. Wrap some electric tape around the contacts, but, not
to much or it will be to bulky and not fit in.
Once you get the switch with the wires ready, screw the microswitch to the sheetmetal mount
using the small fine screws. Apply a VERY SMALL amount of oil to the screw threads by putting
a very small drop of oil on your finger then spreading it around. Screwing it should be a
lot easier.
Dont get the screws all the way in, let the switch have some play for later adjustments.
Screw the sheetmetal mount to the grip frame as if it were a rubber grip panel. Screw it first
without the panel to adjust the exact microswitch position. You might need to use a flat screw
driver around the other side to to move down the microswitch lever for clearance.
Once you screw in the mount, play with the microswitch position until you can succesfully make
it go on and off by pulling the trigger. The microswitch will be activated with the movement of the
trigger rod retainer screw. Tighten the microswitch screws once you get it right. After this you
might not ever need to adjust the microswitch screws.
Look where the the top of the screws are and make a small V shaped notch in the inside of the rubber
grip panel to create a channel for the top of the screws to fit in. Create another notch at the
opposite grip panel to make a channel for the wire to exit.
Once ready, remove the mount screws (grip screws) and place the rubber grip panel over it and screw
them both at the same time. If the notch was done right it should fit nice and tight.
Thats it have fun.
-Tarkus