Itsa good place to start with a can diode without popping it open.
The ones I have are 1 to 2 mm ones. But somewhere round here I have some others but dont think theyre 3 or 4's .
maybe I used those up already, I cant seem to find them now..
Ah well, I need to order a selection anyway as Ive got a SDL-7470 3w 664nm red here that needs help.