@chopper. Thanks for offer, tho if JazzCNC can do it sooner I might take him up on it. While adding additional dimensions I realised I'd made a slight boo boo in the design which needs correcting. I'm updating drawings and will post updates and some new drawings for other parts tomorrow.

@JazzCNC thanks, sooner is better. As I said above there's a few other parts drawings to come.

With regard to current drawing for handle, is depth of boss (10mm) into tube enough or should I increase to 20mm?

The axial slot on the larger side of the boss is to allow the cross screws to clamp the outer shells of two 10x22x6 bearings. I copied this from an existing assembly which I couldn't dismantle. Will this work or does it need a slot radially where the clamp section meets the 64mm dia, 3mm thick hand guard section to allow the clamp to, well, clamp?