Can anyone make custom extension tubes?

Howdy all,

I was wondering, does anyone make custom extension tubes?
I have a Trustfire TR-J19 and TR-J20. The big problem is they are both 3x 32650s, which makes them hard to use with 6V or 12V LEDs. I’d like to have an extension tube that would let me run 4x 32650s. I could run a dummy cell, but I’d rather have the bit of extra power if possible.

Can anyone make something like that, even unanodized/unpainted for a reasonable cost? Or would something like that be a couple hundred dollars or so?

What country are you in keithd?

I currently live in Germany, but I’m due to be back in the States by this August.

I have new 8A 20, 22mm Buck drivers, maybe thats a good option to run xhp 50 and 70 LEd on 6V