Tailcap not working on Romisen RC-F4

[bp78]

My Romisen RC-F4 switch / tailcap no longer works. I figured out how to part it out and holding the switch to the batteries looks like the switch is good but the contact to the barrel of the flashlight is bad. Perhaps the 3.6v ultrafire batteries are too long now or some other issue?

I'd really like forward-clickys, Can anyone suggest a replacement or knows the DX sku for one that's the correct size for the RC-F4?

Thanks.
-bp

 

[Winx]

ShiningBeam has forward clickies for RC-F4.

Try this: remove the switch from the tailcap and rotate it against body. You could say it's kind of sanding as the contact improves. My F4 was dim and got brighter when I squeezed tailcap. After that "sanding" it has been bright all the time.