[ATM] Upgrading a battered 10" Newt focuser

[Martyn Cole <mgc@dsl.pipex.com>]

Hi,

I recently bought a battered 10" Newt to get some experience of
rudimentary ATM skills.

It came with a horrible rack & pinion focuser and I've decided to change
it to a nice Crayford focuser that I bought off AstroMart.

I need to increase the size of hole for the drawtube from 50mm (1.97")
to 60mm (2.36").  The wall thickness of the tube is around 1.5mm (0.06")
and, from the battered look of the tube, easily damaged.

I'd like some help in deciding what tools I should use to enlarge the
hole, bearing in mind I'm not known for my metal working skills :)

Any help gratefully received.

Regards,

-- 
Martyn.
_______________________________________________
ATM mailing list http://www.atmlist.net/