
Unscrew the Mills Bomb Replica top cap ( remember to cut off the spout and putty up the gap)

Saw the stub off

This is a "Pin Vise". Small hand drill. Can be bought at Kelantan Lane / Sungei Road area.

Drill thru' it. Get a small drill diameter if wanna have it in a tight fit.

Get these in a DIY store or "Art Friend".
They are called "Cleats" and Key Ring.

Combine them

Insert thru' and Hey Presto!