Original package :

Neons are protected by 10.5mm diameter polycarbonate tube blocked by 14x14x10mm polycarbonate blocks .
The assembly is thermally sticked giving a really poor result (white traces).

Neon alone :

Neons have a diameter of 3mm, welds are insulated with heat shrink.

Without heat shrink :

Remove heat shrink.

New heat shrink :


Full view:

Put two layers of shrink tubing to help support the tube.

Once installed tube :

If tube still movible, use paper stick.

Final result :

This article has helped reduce the width of 14mm neon within 6mm.

If you have any questions, contact me.