[Cherryville Chuck]

Bosch had an issue with their routers about 10 years ago with dust getting in the switch and preventing the contacts from making a good connection. If you have compressed air try blowing it out. Otherwise a broken wire or brushes as already mentioned.

 

[Cherryville Chuck]

That could be a bit tricky. I have an older DW 610 router that has a collet that looks like a Bosch WK series. Many newer DWs use the same collet as several Bosch routers and at least 3 Hitachi routers and there may be others. I've become convinced that most router makers outsource their collets so more than one maker may have used them. Some of my reasoning for this is what I've found on ebay and from Elaire company who specializes in collets. Try searching on both sites and I'd say that if they look to be identical then they most likely are. Try both the UK and US ebay sites as well as Elaire which you can find here: https://elairecorp.com/routercollets.html

 

[Cherryville Chuck]

That is a very small shaft so this must be a trim router? My DW 610 is a small to mid sized router and it's shaft is around 18 or 19mm at least. I have a DW 611 trim router that is smaller and I'll measure it later to see what the diameter and thread pitch are on it. If it's the right diameter and pitch there's a chance that it might work. Someone else from the UK asked a question about what appears to be the UK version of that same router but it had a 5 digit model number instead of 611 like ours does. It started with either 26 or 29.

 

[Cherryville Chuck]

The 611 turned out to be 15mm so it`s too big.