I bought the pulser upgrade for my telrad when I bought the telrad. Honestly I hadn't even used the telrad yet so it was it wasn't a purchase of tested need, more of an impulse buy when picking up a ton of other bits and bobs I did need.
I have some comments that might be helpful to someone installing it or thinking of getting it, and then I have a question.
The kit comes with a piece of paper with instructions at the top and a drill template on the bottom. The template is not great. For one thing the template has an incorrect width of the actual telrad by about 1/8 of an inch, and secondly it has inches in decimal which is just odd.
I used a poker and made careful holes in the template targets, lined the telrad up behind the template (as best as possible given the height mismatch) and put a silver sharpie dot through the poked holes onto the telrad. Then I drilled them out. The recommended drill size of 9/32 is incorrect as that is not big enough for the threaded part of the knob stem to come through, so you'll have to go a step up from that.
Feeding the knob stem from the inside through the hole you drilled is tricky. Until the tip of the stem goes into the hole slightly there is not enough space diagonally to comfortably wedge the circuit board down into the body of the telard. You could probably force it but I didn't want to. (If that sounds confusing you'll understand once you try it). The very easy solution to this is to put the drill sorta sideways against the top edge of the inner side of the hole and mill out a small chamfer on the top side of the hole. Once you do this the knob stem can get that millimeter of angled insertion needed for clearance and the thing drops into place very easily. Obviously the chamfer is not visible from the outside.
Finally, the threaded part of the pot stem is not long enough compared to the thickness of the telrad plastic, even with the pot body flat against the wall, there is no way to get the nut threads to catch on the other side with that tiny washer in between. I had to ditch the washer, and then use needle nose pliers to push the nut while turning it to get it to catch the tiny bit of threads coming through. I was able to get a half turn on the nut then, not great, but I think it will hold.
Hope this helps others trying to install this thing.
Now my question:
This isn't a big deal but I wanted to ask anyway: The instructions say to use the new knob to cut the power. The thing is that the second knob isn't as nice as the first lever-knob and my preferred use would be to leave the pulser knob somewhere in the middle and use the original intensity lever-knob to turn it on/off.
The instructions say "The switch on the new control turns the power to the instrument on and off and, to avoid battery drain, must be off when the instrument is not in use". However I'm not confident they are speaking precisely. The old knob will still cut power to the illuminator, so it might work equally well as a power switch. However there *is* new circuitry behind the illuminator now, and I'm wondering if anyone has knowledge of the pulser circuit to know if it would leak current even when the illuminator is switched off?