It's been a not very nice day today, overcast and cool-perfect for spending an afternoon in the workshop!
Having cleared a bit of space on the workbench, attention has turned to assembling the cylinders. David's design produces a sturdy slidebar assembly, but you do need some small (tiny) files to size the apertures in the cylinder covers.
Here I am showing one completed unit, and one with the cylinder cover off, to show the internal assembly.
It was quite fun to make these up, now for the cross heads!