Good source for a lockseed switch and LED mod tutorial?
 

I've had a tough time finding a good breakdown for how to do these and it's driving me nuts. I just tried the string method and that was a failure. I'm seeing something about a 3 battery mod, but that might just be for gashapons? I'm not really sure how to mod a collection of candy toy lockseeds (but youtube has PLENTY of people showing off that they've done it).

I read the kamenriderfeverfornow tutorial, but that's got plenty of holes. I searched Google, Rangerboard, here, searched Youtube for "ロックシードLED変更" (lockseed LED modification tutorial), and not found a good breakdown yet.

Anyone here have a good breakdown?