Stuart "Double 10H" project

No, not a Stuart "Score" - that's the horizontal twin derived from 10H parts in the same way as a "Double Ten" derives from the 10V.

This is a project to couple two 10H mill engines together on a common base, with Watt type governor made from a 10V trunk guide casting.

Much work done - both engines turn over freely, base plate has been drilled for fitting. Complete with set of four new drain cocks and a displacement lubricator.