New toy: Setting up Colchester Student lathe

[ocemar]

Hello Jonathan

I found this forum to get more information about English lathe Colchester Student 6''
I am presently happy owner of this lathe and trying find some technical support from you guys.
According oil shell tellus 27 and 33. On my lathe is written on the labels that I should use tellus 33 in the head-stock and gearbox. In the instruction is written that 27 is for headstock, 33 for gearbox.
Any ideas why on my labels in written 33 for headstock and gearbox?
I called to shell representatives and they give my offer for new oil correspondent to old types. Their recommendation is Shell TELLUS S2 M 46 (for 27) and Shell TELLUS S2 M 68 (for 33).
I bought lathe only with one back plate and after measuring I can confirm that mine is long taper L0.
First problem I have: Every time a screwing and unscrewing backlpate to the spindle nose I can see spindle runout, one time is there and other time is gone. The taper looks good and the nut is well screwed.
I probably will need to get or make some spares to reduce slack on the longitudinal feed handle and cross feed handle.
My lathe was imported by German or Belgium company so is already metric converted (good for me)
Serial numbers showing me that the production date could be around middle 60's.
I have straight bed with gearbox for metric and English thread. My gears on the side 21T, 120T and 35T. In the instruction I found one more 42 T. For what is this one?

Thanks for your support and sorry if I translate incorrect some technical words.