Was gonna start a new thread but I don't think this is worthy, so instead I'll bring this one back up.
I've tried every type and size of plastic pipe on my plows with the same result, BROKEN or BENT pipe. Works great until it breaks or falls off.
After plowing up a ton of gravel this year in the first storm I decided to try steel, like I said the pipe idea is great but just not plastic for me.
Found a piece of light weight steel pipe in my pile, it is an odd ball size around 3.5 inches, pretty thin wall so it was easy to cut an inch slot out of it. I cut the slot wide enough to drop pieces of 1/4" plate down inside the pipe so the pipe would stay steady and not move much.
The plate rests flat against the blade and is welded at the top of the slot and there was just enough space to get in there and weld the plate at the bottom of the pipe.
Hand cut some end pieces with a torch and that's welded all around the end of the pipe and bolted to the side of the plow. Couple of minutes on and off.
Got to try it out and it worked great with out any damage to the pipe except wear on the bottom, reduced the scrapping and removal of the stone surface by 95%. I'm happy, as it was a PITN trying to be so careful not to scrape up stone, it took alot longer and still made a mess. Now I just plow like it's on pavement, was faster and no stress.
Only problem may be that cause the pipe is very light I may have to weld another skid piece on the bottom if this one wears out, but that will be well worth the effort.
This is on a 6.5 foot western plow frame mounted to JD 4310
JB.