"Chris" wrote
How can I get rid of tussocks in rough grass?

The idea is to turn it into lawn by simply mowing.

However, there are some tussocks - about eight inches or so across - made
of extremely dense grass.
Driving the lawnmower over them can sometimes even stall the motor.

What actually is a tussock?
And how can they be defeated?

Chop them out with a mattock or spade, fill the holes left and reseed or
trim right down with a strong strimmer/brushcutter.
It's a rough grass so not any good for a lawn anyway and constant mowing
will eventually get rid of it.

--
Regards
Bob Hobden
W.of London. UK