After some time I discover that stands are completely useless for me, so I decided to keep the bench
and make bicycle repair stand from the stands.
Step 1: At first of all project.
The original weight stands are made from square steel pipes/profiles 40mm diameter.
What I used:
some old front hub with skewer (actually only axle with cones/nuts and skewer)
piece of 5mm thick plastic
Some 10/8/6mm screws, washers and nuts
10/8/6mm drill bits
Step 2: Stand
Basically I've took apart the stands completely, and made "fresh start".
I cut the main tube (vertical) so the bottom bracket will be on about 75cm just enough to work comfortably. I'm not a giant ;-)
Basically nothing to explain you can see on the picture how it's made.
The design of the feet might look strange but the point was to keep the stand folded and hang on the wall when is not used.
Step 3: Horizontal tube (bicycle rack)
I've measured all 4 bikes I have (frame sizes vary from small to medium: Mongoose M trekking, specialized S road, Giant M road, Giant S MTB ) and is more less similar distance ~60-65cm between bottom bracket and fork axle. Fortunately the weight stands had adjustable height so I've made the horizontal pipe adjustable for future flexibility.
details of the axle and skewer you can see on the picture and sketch.
Because the smaller pipe was slightly wobbly I attached pieces of plastic at the end.
On the other side I screwed two pieces of thick plastic to support under bottom bracket and make a gap to prevent cables touching the rack (see photo)