I'll try to explain how my "Skates" work. If you look back at the original photos you will see the front and rear skates are joined by a length of 25mm pipe.
This is the key piece to the puzzle. The rear skate lifts the bike exactly like any paddock stand would do, with the rear wheel off the ground. It fits exactly around under
the rear axle nuts to support the bike. You can manoeuvre the bike quite well only using this skate alone and the front wheel as a pivot. But that was not good enough for
my needs. I wanted the front wheel off the ground also. Much easier to move and work on the bikes anywhere in the shed, whilst also raised off the floor about 100 mm.
So the front skate with the pipe attached, also lifts the bike from the axle nut and inside the "t" bar on the right hand side. The brackets are from a old paddock stand, adjustable in and out. I just turn the front wheel to the right a bit and put the skate in place under the axle and lift the front wheel up with the pipe lever being pushed down. Then I pivot the pipe lever and front wheel straight now on the castors, where it simply slides into a bracket on the rear skate, with a pin to secure the front to the rear. Keeps everything together, very stable. Steps in reverse to drop the bike onto the center stand.
Another advantage of these is that the bikes stack very close to each other side by side, in opposite directions, saving even more floor space.
Make sure you buy good quality castors, makes the bike glide much easier. These are solid plastic 100 kg rating each wheel. The small castor on the rear skate leg is 50 kg rating.
As with any castor wheel it is vital that it's axle is as close to vertical as possible to spin around on its bearings properly, but we all know that, unlike every shopping trolley in the world.
You'll notice the rear skate has the lever arm cut off short. "See original photo post of both bikes" That was to gain some extra turning space. It has a telescopic piece that is removable and sits in the bit of square tubing facing up for easy storage.
Hope the extra photos help.
Just tried to post all the photos, have to do 2 posts on this sorry.