You mentioned the jammed roadwheel, Percy. When assembled properly, Pz IV wheels have one of the most fluid movements you'll find on any model tank..
However, the builder
might have glued the shaft to the wheel somehow, when bonding the two halves together- with an excess of zeal..and glue.
Perhaps he used superglue instead of Tamiya's ABS cement for the job.
You could always use one of the two spare wheels, that come with the model, to make a replacement, if necessary. I think I may have the bushes and shaft needed to build a wheel. Alternatively,
you could remove the reluctant roller, and use de-bonder to strip it down.
"Get your facts first, and then you can distort them as much as you please"- Mark Twain.
I think I have most of the bits needed to make a new one, but stripping the unit down, should sort the problem out.
