Thanks Darren and Wes
I manged to finish the smaller cone centre today
first up i turned up the inner part of the cone for the bearings making them a light press fit .

Then it was flipped around and the tapped section was rough turned ,,,no need to worry about it being concentric with the bearings,just ruff it to size and the centre hole tapped M6

Then every thing was pressed together and the circlip fitted ,sorry photo wrong way round

Then the centre was fitted to the tailstock and a short M6 cap screw fitted to the cone,making sure the cone could still rotate

Then using a 5mm allen key fitted to the lathe chuck and plugged into the M6 screw ,to drive the cone

the cone was turned TRUE, the allen screw will come in handy if you say catch the cone with a tool or it wears its not hard to clean up the tapper ,also of you need to strip the cone remove rear circlip and use a longer M6 crew to split the centre ,jacking the cone off the spindle

smaller one finished


tomorrow i hope to get time to machine up the 100mm cone
Regards Rob