Chad:
It is some amazing how threads can diverge.. anyways.. maybe I should have included this in my first response. And as always, this is just my opinion and opinions are something that we all have one of -- for what it is worth.
1. Yes PVC is cheap, and if that is the route you would like to go, then I would suggest that since you will in all likelyhood require more than a 1 time shot.. you really should invest the time and make a jig that is safe and you are comfortable with, to use with the equipment YOU have :!:
PVC although inexpensive will not last long, I would think, so maybe another material is the way to go.
2. I think someone mentioned heavy rubber stripping, or rubber cutting edge, but yup, it can fetch up on dry pavement. However, if the trip spring is set right, you shouldn't have too many problems with it. But with a rubber cutting edge you are back to the same problem with the gravel sections. You solve one problem and still end up with the original.
3. One thing I discovered last night whilst finally getting some seat time..
Yup, we finally got enough snow to do something with
, was that the blade rides well on the skids. And if you actually use it in combination with say the rubber cutting edge or the PVC pipe, then you may get some pretty fair results.
What ever you do please do it safely and