Mr. Matson - -
For unpaved driveway plowing, I made an edge by cutting the sidewalls out of a tire, and stretching the tread across the blade.
The holes are in the middle of the tread; it therefore protrudes about 2-1/2" below the steel bottom of the blade.
Then, by plowing in 'float' (and using the tilt to keep the blade parallel to the ground as needed), the blade rides on the tread curled under the steel lip.
For me, this avoids tearing up the road surface (compacted road base here in Colorado). It still clears well, but doesn't damage the road.
Our driveway is about 800 feet long with several hairpin turns and pretty steep grade, so we always plow downhill.
I've plowed about 18" of our 'dry' snow with little difficulty.
25" means some pushing sideways off the road to make room for more snow, and occasionally plowing layers (8"-10" each) since the PT425 can only push so much before spinning the wheels.
Our worst snow in the last two years was a little over 5'. That required about 3 hours of work with the 4in1 to actually move the snow off the drive.
Fortunately, that only happens every 10 yrs. or so here.
18" is not uncommon, though.
I've attached a pic of the ugly, but useful blade.
When one edge gets chewed up, I just flip the tire tread over and get another few months out of the other edge.
Hope this helps. Apologies for the mess behind the tractor - sub zero temps & house under construction. Neatness disappears with those conditions. /forums/images/graemlins/blush.gif
Mark H.