Finished up assembly of the last major acquisition for the barn yesterday - a NoMar tire changer. Like just about everything else in here, it's moveable due to the decreasing amount of floor space. I can shuffle it around, as needed, to keep it out of the way.
Mounted it on a 4' x 4' x 3/8" steel plate that have ball (transfer) rollers on the underside. To lock it in place when in use, I have a series of Allen head (set screw) jacking screws that I screw down. To keep the points of the screws from digging into the concrete and tearing it up, I've put some 1/8" thick pieces of flat bar that the screws contact when in the down position. This also spreads out the loading and helps insure the plate won't budge.
Will try it out later today on a couple of spare Connie and KLR wheels so I can learn the proper technique for it's use.
All pix of this last project in the last pages of: