Thanks for all your lovely, positive comments Chaps! They're all
very much appreciated.....

Finally managed some productive shop time, over the last two days!

Experimenting with the candles, had shown it needed more air holes in the base. Also, a larger burner hole.
Thankfully, I could easily replicate the original set up, and do some more chopping. No pics, sorry!

I made a burner tray, from a piece of 2" x 1" alloy tube, slit down the narrow side.........

Locates securely over the sill step.
When thoroughly warmed up, (30mins +), produces a rip snorting 170rpm.......

I can leave a single central candle, for slow running. Around 80rpm.......

And, the final video........
Very pleased with the outcome!

David D