Whoops - you're totally right! I remember the dovetail...
Anyhow - if you've gone and over-screwed the hop-up adjuster, it's probably rattling around inside the gun still.
If the hop-up is busted (it's plastic when you get it)... you could probably source a metal hop-up unit.
If it's something else, you might just carefully take it all apart, and use the manual and see if putting it back together helps - there's really not that many parts to break inside it - and I hear that they last a LONG time before wear and tear get to them.
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