Search:

If you want you can extend the slot that the focus knob moves in with a file to really focus the beam to a nice projection of the emitter. Gives a bit more reach with the light.

The batteries fully charged should be 4.2V and drop down to about 2.7V when discharged. 3.7V is a rough nominated mean. The circuit board will regulate the voltage and current to the LED and would...

D - All of the above

I get them from DX and AliExpress. Often they are not available on the right board so I do the old switcheroo.

You may want to add some heat sink compound/silicon grease to...

https://www.youtube.com/watch?v=Jtx_egzor8g

Yes it is an aluminium circuit board/heatsink. They come in various shapes and sizes. Often there is also a nylon spacer in there as well.

We are talking the same animal. Yes you disassemble it and take out the while circuit board at the bottom. I hold the board in wooden 'soft jaws' I made for a small vice and apply heat to the back of...

Just remove the little board the LED is on. Apply heat to the back of the board (I use a heating attachment on a $10 gas soldering iron) till the solder melts and put the LED back in place. Allow to...

Actually they can be put back on, I do it all the time.