de-varnishing?

I am a new user of your forum and would like thank those involved as you are working for free so I hope you get enough pleasure from it.
I an new to working on Cox engines (not big engines) and I have a question about the proper way to de-varnish an engine. I have MS and decided I needed a hobby as I can't work a full timejob so I purchased 4 or 5 piles of junk cox engines and I want to restore their performance without jut buying new parts. So, would de-varnishing be using a drill and making a mandril for a slice of scotch-brite and then lube and drill for a while ? Ant suggestionswould be great! thanks!
Jeff

Hello, I have been using one of these brushes to devarnish my cylinders. They are about $7 plus shipping off ebay. http://item.mobileweb.ebay.com/viewitem?itemId=230549322365&index=1&nav=SEARCH&nid=47032524956 I also know that in the cox engine manuals it says how to devarnish the cylinders. (you can download them from my site, link is at top of forum) i'm replying to this post using my cell phone, ill retype this once I get on my computer.