In between fitting the cladding to the east wall of the house extension, turned my new 19T 530 gearbox sprocket into a 520. Somewhat time consuming, and again using the Emco lathe for things it wasn't designed to do. But if I get the result, I'm happy. Angle grinder, thin cutoff wheel ... add an hour or two and stir. Remove the width then angle cut for profile.
Must ask Red (you reading this big fella?) if he has gearbox sprockets in 520 ready to go for net time!! Would also like a 20T if there are any already created - otherwise I have to cut and shut an old centre into a new 520 20T outer ... more hours of fun.
Was surprised that the 530 is nearly 2.5mm wider than the 520. With my engine shift 3mm to the right plus the 2.5 my 17x160 rear will have plenty of clearance and I don't have to outrig the sprocket at the gearbox and strain the weak output shaft-to-mainshaft link.