Hi fxxrrr,
That spring arrangement is not one I’ve seen before. But it works! Truth be known if they are needed then something is v wrong with
the drive. Might just be gummed up as Nath says. But it an ingenious solution to the problem!- at least in the short term.
I just had a rummage in the shed. I thought I might be able to help you out with your wheel problem but the ones I was thinking of will have the same problem- too wide and no room for the collar. Sorry

Cheers,