Tips on removing stuck tailcap on copper Lumintop/Reylight Tool

LED Flashlights – General Info
1

I left a copper Tool in a drawer for a long time and just started using it again. I replaced the old aaa battery by removing the head and the light seems to work fine. However, I noticed that the old battery leaked a little bit, and the tailcap clinky switch feels like its fused onto the body. I looked down the tube with a flashlight and can some leakage near the spring. Cleaned this out using a toothpick.

Any advice would be appreciated. I would like to get the cap off to clean it better and grease the threads. The threads were probably light on grease when it was put away.

Thanks.

2

Try coke? (the drinking kind, not the sniffing kind).

3
4

Actually, whenever I have to deal with those hateful little alkaleaks, soaking what’s tainted in plain ol’ vinegar usually dissolves it.

Only Cu might react with acids, so try it for a few minutes at a time, rinse, look, make sure it doesn’t pit it or anything. But AcOH will dissolve the leaking/dried KOH / K2CO3 just fine.

5

Yep, vinegar.
Perhaps mix the vinegar with a litle hydrogen peroxide.

On the outside, try a drop of penetrating oil around the place tailcap meets the battery tube.

Gentle twisting tighter/looser over and over, just to try to work the contact loose.