Hey buddy, the slipper is there to protect things, unless you have it insanely loose then it sounds like your rear diff might be loose. I assume you glued the plates to the plastic diff halves? if one or both of these break loose then the diff will simply slip no matter how tight it is. The worst case scenario is that the rear diff itself is too loose and has been slipping a lot - which could quickly kill it.
The problem with a closed car like this is that you can't easily tell whats slipping, the slipper or the diff, and it's hard to check the tightness of the slipper. but 3-4mm of layshaft exposed after the nut is usually a decent setting.
Having said that, if you mean you have removed the slipper and reinstalled the original item, and it's still slipping - then it's the diff.
take out the rear diff, degrease it, check the plates haven't come loose, reassemble it with a touch of thread lock on the end of the screw. If your only experience of differentials is a FAV then you might not realise how much tighter the action on a ball differential is supposed to be - they aren't supposed to spin freely.
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