I was very lucky in two ways with transport: we never put it on it's back because we used a van (simply lucky).
And also: the mechanism bolts (not the transport bolts) were at least screwed tight. I also didn't know about that until I put up a video of it playing and somebody told me I had to loosen those bolts/nuts....sound improved dramatically after that and it sets the mechanism on it's spring so it can move freely a bit, which also drastically reduced the movement sounds of the mechanism.
If the machine is not on Freeplay and you want it to be Freeplay, you can simply pull out the pricing module (with power off of course), at least that is how it goes on the USC1.
The previous owner obviously never knew about the mechanism bolts and he had rigged some external switch to credit the machine which looked terrible....