Cartridge mount screws - stainless steel

For $199 i will have to try making some carbon fiber bolts. I have machined carbon fiber rods down to size so i will have to try threading it now.

Thanks guys i have tried a local hobby shop and one bolt supply and they have shorter stainless but not 20mm. I may have to machine up my own out of brass once i find the proper size die to cut the threads.I found plain steel screws at Radio Shack but it looks like i can't use them.

Thanks everyone for your replies.

I was not able to locate stainless or brass screws today at least not 20 mm length only shorter ones, they told me they weren't available from the supplier. I purchased a die and made my own brass screws on the lathe , took about .5 hr.
Mounted up the ZYX Airy 3 on the Graham Phantom with the spacer they provide now i have to re-adjust everything.
I had to install the spacer under the cartridge cause my VTA was as low as i could go and i needed to lower it more.