go down to your local camera stor and ask for a T2 -->M42 adaptor they are about 30-50 bucks depending.
Your using a Newt make sure you get a MPCC
Here is a supplier that sells them at the proper price i can vouch for Peters speed and quality of service! the MPCC is half way down the page.
Make sure you get a good set of collimating tools. cats eye does the job right, but there are others too.
BM