I am trying something a bit different for scratchers that weigh almost nothing and should be unbreakable. I put a Woodys carbide stud in the inside rear corners of each of my PowderHounds skis. I used 1.4" long studs and a aluminum stud backer washer. Sitting on the floor of the garage they don't touch the floor. Have heard this works really well. The cheapest studs I could find were Woody's Mega Bite at $39.95 for bag of 24 and $9.95 for a bag of 24 aluminum backer plates which can be used for raising or lowering the stud a bit to get it right, and also one for underneath the ski for the nut to go against. Still cheaper than anybody's scratchers and you can give some to a buddy if you want.
Pretty pleased with how it turned out, the two studs, two washers and nuts only weigh 3 oz, sure beats hanging a lb or two of steel cultivator springs off the rails.
Good Luck