@Stephen_Eaton I’m using the 75V 300W 60k rpm spindle with the Sunfar E300 VFD. I’ve bought it on http://ebay.co.uk with Europe shipping to skip the waiting and the VAT. (Not available right now, but here is the same spindle from China: http://www.ebay.co.uk/itm/300W-75V-4-5A-60000rpm-Water-cooled-Spindle-Motor-Inverter-Bracket-Pump-Pipe-/291947362956?hash=item43f96b3a8c:g:~EEAAOSw9N1VklFD) You can also get the GDZ48-300 one with the black VFD. The spindle is 48mm diameter vs the 52mm original one so I 3d printed a sleeve, but you can also wrap it in paper as long as it’s stable in the clamp.