Hello fixin-it
This has certainly been a challenging repair!

Looking at your previous posts I can't help but think this is a later machine
fitted with an older model cutter deck. There-in lies the problem.

https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/74604/re-rover-colt-5.html#Post74604

I hope someone can offer some suggestions ...

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Jack