upgrade tasco optics

HI I have a 4.5" f900 tasco.
1. There is a slight blemish on the secondary mirror due to abuse by previous owner but it doesn't obviously affect th image.
Nevertheless, I am considering changing the mirror for a superior one. Any recommendations?
2. The secondary mirror is 114.5 millimeter would it be possible to use a 130 mm secondary (given tube size of 138 mm)
I realise most of you guys would use this scope to put out fires with, (!) but I got it cheap and have had some good experiences with it, so any suggestions (other than throwing it away) would be appreciated.

Kind regards,
Martin

A smaller mirror is pretty cheap, the secondary mirror is very important and any thing on it causes a lot of scatter and loss of contrast.
If you can do it and not be too expensive, go for it.
Floyd

An EBAY store by the name of Telescope Warehouse has what you need. "Scopehead" has a brand new secondary mirror in a spider assembly for ten bucks.
Howzatt!?!?!

Ehh Peter, it's like you already know me!
On my old Audi I've done brakes, shocks, bushings water pump, carburettor, and last but not least, rebuilt the engine. (Think lifting a scope is bad? try an engine! but then again I walk sort of funny after it!)