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Dave - "The speed of sound depends on temperature..." To a point. It actually depends on density. Whilst the density of a gas is affected by its temperature, it also depends on pressure, so the confining conditions and gas flow. I think the variability of everything in a miniature boiler would be nighmarishly difficult to analyse to the depth necessary. I don't presume to deny it would not work but could be far trickier than it seems. ... Yes, I'm you're right. The more it's thought about, the more difficult it gets. Pretty sure it would work aimed into a full-size firebox, and maybe even ...

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I'm sure a gas spring would be fine, provided you could, firstly, source, and then afford one (or more). I like simplicity and cheap solutions, so my suggestion would be a tension spring, acting via a cable and pulley(s). The spring's force:extension law would be made linear by arranging the 'pulley(s)' to be of varying radius - think fusee. (It would doubtless look a bit ugly - quite out of place on your masterpiece...). BTW, it may be an optical illusion, but the axial 'depth' of the 'teeth' of your Hirth coupling seems constant across the radial direction, and the 'tooth' flanks appear pla...

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