Wadkin TC80 spindle - seeking info

[Mud]

Hi all, I have a Wadkin TC80 spindle intended for my next machine build, and beyond a marketing pamphlet I have no real information, i.e.:

*air-cooled
*7.5kW
*0-20,000rpm
*30 taper
*hydraulic tool release

Additional info I have ascertained:

*green
*heavy

I believe the machine it came off of was an Olympus.

It has a threaded hole in the front that did not have a fitting or bolt in (just taped over) which has me wondering if it's meant to have a continuous lube feed or forced air cooling. This was the standard spindle Wadkin offered at that time and not a fancier higher load/higher precision option. The spindle seems in good condition, so I don't really want to take it apart! Maintenance requirements would be great to know. Any ideas?