The following Leclerc loom models have been sold with treadle springs.
Colonial 8s
Colonial I 8s and 12s
Nilart 8s, 12s and 16s
Nilus and Nilus II 8s
Compact 8s

When more then 6 treadles are connected to the lams, the weight of the treadles can lift the shaft frames up or make the movement down very difficult.
To solve this you will have to install springs that will support the weight of each one.

FLOATING SHAFT:

A floating shaft is a shaft which remains in upper position or rides when it should be down.
Usually the spring attach to the treadle correctly fix the problem.
If you have the springs and still have this problem, you can add some weight at the top of the shaft frame. Usually this problem occures only with one shaft or two.