the dual mass flywheel is just that, 2 bits of flywheel to take up the slack
thing is, they tend to not last too well with the amount of torque produced and the easy fix is to get a new single peice solid flywheel fitted instead
the only problem with this is that you will need to remove the box and clutch, which will mean it's easier to fit a new clutch at the same time seeing as it's going to cost that much money
here are some pics of what a fucked flywheel looked like:
that cost us nearly a grand to fix