OK, I always thought the floor locks on the jack were a little cheesy, especially considering how well made the jack is.
The two 1/2" bolts had to be turned down with a wrench in order to be effective, and then inside the garage I had to use plywood under the bolts to keep from damaging the garage floor.
So, I found a couple of "fluted thumb screws" that work perfect.
The screws are all steel, including the handle. You have a choice of pads, steel or Delrin, I chose Delrin.
These work well enough that you can easily lift the jack by turning the screws by hand.
Just under $23 before tax and shipping. A significant improvement, especially considering how easy this jack rolls with the bike on it.
Was waiting for the invoice to finish the post.
Here they are
http://www.mcmaster.com/type in this number in the search box
90165A524
Thumb Screw with Removable Swivel Pad Fluted Knob, 1/2"-13 Thread, 2-7/8" Length
In stock at $11.31 Each