JCB Plunge Router

[Sorento]

Good afternoon

I have recently adapted my JCB Router which is a good 13 to 14 years old to a suitable table to make a router table. I realised that I needed a collet extension which I ordered and found that it is too big but any way I stupidly dismantled the router hoping to do something and it came apart quickly ( to quickly) and I didn't see where this long copper terminal goes. It is attached to s green wire which looks like it goes to the variable speed circuit board but where it sits is beyond me. Has anyone seen this before and could you advise where it goes.

Many thanks

[big-all]

picture might help
whats on the loose end off the wire ??