Hi,
Just thought I'd share this with the community!
Whilst repairing my CPC464 I had to replace a broken tape drive counter reset button. There is a hack out there already but if you're lucky enough to own or know someone with a 3D printer then this is an excellent solution which I can confirm works perfectly.
The file is downloadable here:
https://www.thingiverse.com/thing:3340706 (https://www.thingiverse.com/thing:3340706)
Unfortunately the user does not have their account set up for tipping but I did messaged them as I would tip for this useful model.
Hope this helps others.
Pledg.