David Tyler wrote:

Small Pendulum (up to 30ft LOA) and Medium Pendulum (30ft to 50ft LOA). There was also a Big Pendulum, but I think only one or two were built, one of which went onto British Steel.

I've had SibLim's requirement in mind as I've been thinking about Weaverbird's gear....

I'm sure the Hasler gear wouldn't work. Just being sentimental.  Thank you for thinking about SibLim, and I shouldn't worry too much about getting it ready for Autumn - even my next Autumn might be pushing it! There's only little me, and somebody has to cook, wash, make bread, brew beer, clean, and chair the JRA.  But that's all right, I'm happy with my plodding progress - it gives me time to think through the next stage.