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I had not seen that copper cap thread before. I've done something similar, but more complicated. I used a copper cap but I clipped it the other way with the led on the cap top. Drilled out and tied...

Does anybody have any templates for the shrouds? Both the body and the emiiter shroud, otherwise I suppose I could try to find a good image and scale to size, that has its own difficulties. Thanks!

It's unclear if you are driving these three less off of the main or using the extra less in the blade builders. A n mosfet won't work with the side less AFAIK you'll need a pnp as they have a built...

Is the original poster still around? In the diagram you mention a bridge... Were you saying you bridge +/- with a bead?