Thanks for your helpful thoughts guys. I managed to find the perfect knobs at Jaycar - 45mm black plastic with the correct size hole and 2 allen screws. Problem is solved and it works a treat.

Happy shunting.....

Don

Hello Joe,

Thanks for your reply. In the meantime I managed to get it off - it is a tight sliding fit on a splined shaft and needs a fair bit of persuasion. The reason is that with my stiff hands I find that the taper on the knob makes it difficult for me to handle. I'm going to replace it with a simple cylindrical aluminium knob if I can find one.

Thanks again and best regards,

Don

Hi, can anybody please advise how to remove the speed knob from the 46605A controller?

Thanks... Don (Australia)