Denford Triac Spindle making an odd noise. Bearings at fault?

[m_c]

My mod was quite a bit of work. I think the lathe work alone took about 3-4 hours, as it was a big lump of bar to hollow out.

Now I've had time, this post gives the process of renewing the bearings - http://www.mycncuk.com/threads/10344...8817#post88817

And the spindle motor mods start a bit further down that page - http://www.mycncuk.com/threads/10344...9732#post89732