[Mini] Can any one place these frames that are supposed to be a cheap way of rolling a car

[Dr John C Bullas]

I have 2 of these bad boys but cannot find any reference to them on the
interweb

If I had an old mattress I'd try them on #9 but as I don't, I won't

Really looking for a supplier/source to work out what they were designed
for!

https://www.facebook.com/DrJohnBullas/posts/10163981251000251

Cheers

FB

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