There is a wonderful tutorial here somewhere that shows one of our CPF members using a regular pair of scissors cutting off the shaft of the reflector. You can do it too, just take your time and only cut off about a sixteenth of an inch at a time, go in a circle and take a very small bite out of it at a time. I find if I angle the scissors kind of down and away from me they cut better.
With the Malkoff dropin all you do is unscrew the old bulb out, then push the Malkoff drop-in down into the flashlight tube flush with the top of the tube, grab your #2 star screw driver, gently tighten the screw which will wedge the drop-in into your flashlight securely and you are 99% done. Install your head and see how you like the old reflector.....it will give a very nice throw.
If you want more spill, then get out your Krylon Gloss clear, hold the reflector about 20 to 24 inches directly below the spray can and give it about 3 or 4 short 1 second bursts which will coat the reflector with a highly stippled surface. Let that dry, then install in flashlight and test.
If it isn't enough throw and way to much spill, get the reflector out and respray this time 6 inches away at about 45 degrees downward, spray light bursts while rotating the reflector for even coverage.
What I have started doing at this point is that I go for a light orange peel. It will take about 4 minutes to do but rotate and spray and as you get more clear on the reflector it eventually will almost start flooding the reflector as you will see the stipple go from small drops to bigger drops, then it will all start to flood together. Just take your time and keep lightly spraying, stop for a few moments if needed, then keep adding more. What I have gotten is that great throw that I want with very good spill without loosing the throw and most of the nasty stuff (think doughnut) is gone too.
On the wife's flashlight, she has lots of spill because she won't be using it for search and rescue, just stuff around the house. That's all she needs. If she needs search power, she knows to come get my flashlight (with the Malkoff drop-in).
You can do this.......no problem.
Bob E.