Repairing sds drill

In message , freddyuk writes

You haven't said what's not working - I take it isn't going round?

Maybe a jammed gear box or somesuch?

If it a cheapie then probably yes.

Does it make any noises when turned on? Does it hum, emit smoke, or make monkeys fly out of your nose?

The message from freddyuk contains these words:

Are they long enough?

Failing that, Netto have one starting tomorrow...

I am trying to repair an SDS drill with roto stop.

The power is getting through the switch to the windings and th commutator revolves easily. There is no sign of burning or othe damage.The brushes are there and live.

Any ideas what would cause it to cease working? Should i just bin it

-- freddyuk

No noise , no smoke, no smell of burning, the bit spins freely so no jammed and the whole coil is live so not the switch. I was just interested to know why it would suddenly stop.

Anyway sent wife off to Netto for a £20 special

-- freddyuk

The message from freddyuk contains these words:

I've had brushes go suddenly like that. Try fettling them.