Quoted from JoeJet:Isn't that the same thing?
Here's my contribution - do NOT rely on these unless you have a perfectly level surface. I busted mine in 2 min moving pin on legs from garage to driveway.image_20478.jpg 75 KB
These things are junk. They will start to bend if you leave machine sit on them for more than 24Hrs. They will hold up for older games like EM's and early SS.