Go to your shop and buy one MRP roller, get 2 thick cable ties. Put a cable tie around your chainstay so there's a few mm's of gap between it and the stay, then slip another cable tie through the first one, and cable tie the roller under your chain. Tighten the cable tie as much as you like...
I do not understand what I just wrote, but I hope you do.
-Jonno
Oh yeah, PM Ryan, I saw this on his bike...