Rob;
Hi!
I confess that I have been watching your tackling of that old Nashorn kit 6001 with certain "unhappy expectation"... It has a long and seemingly evil reputation that I suspect was earned fair... and those sprockets have been in that reps list before.
As far back as 2003, Neville Lord did a build of it and did several corrections along the way - those sprockets being one - they were known then to be too narrow.
His fix, and, IF you have the parts, easily also your's, is to replace them with better and wider sprockets from another older Dragon kit - I think he actually sourced some from an old StuG III A, which apparently has a spare set! He noted that they could also be had from other old Dragon Pz. III kits.
Of course, this being an "OOTB" build...
Lacking a spare set, you can fix this one pretty easily by cutting the sprocket apart and adding in some spacer to make it wider. I would expect that this route should fit OK into the rules for this OOTB....
IF you do decide to fix them this way; remember that you will loose some plastic from the saw-cut itself... and you'll want to add some to your spacer to make up for this. I went down this route once and conveniently overlooked the fact that the saw actually removed some of the plastic
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!
PS: IF you want a few other tips on this beast that are pretty easy... Google the kit and follow the leads to see N. Lord's build tips (2003 post).
Bob