Or indeed a (somewhat modified) beeswax foundation roller:

https://www.amazon.com/Beeswax-Found.../dp/B01LZE05HU

(Chances are my grandad had one of these - long gone now..)

Unfortunately none of this hardware's cheap - hence the DIY approach. Still won't be cheap, but it'll keep me occupied..!

If you made a cock-up, would you edit it out of the video - Just asking
True that, Rob. It's why my vids tend to be short and finish abruptly...

Wal.