Thanks for that. I'm told the axle is 110mm, but I'm not sure the seller is confusing that with the fit, as I have an SA 20 inch wheel, where the distance from end of spacer to other end of spacer is 110mm. The frame I;m looking to fit it on is 135mm. I don't mind trying to bolt it on to shorten the distance. My main concern is if the axle is too short.
On the other hand, I don;t mind cold setting the frame, which I assume means simply bending the chain stays in, but how does one do it to ensure the bend is equal. I image you need some weight (like standing on it) to bend a stay in permanently.

Many thanks for the input.