suprised the DMF didn't just get welded up and a quick skim after to put it back into true
welded loads of flywheels where there has been no SMF conversion kit and never had a problem with it. but if you think vhauxhall flywheels are bad try hyundia they can and will fail sub 10k miles but there again they are held together with washer thats just more or less crimped onto a tube through the center of the flywheel i've had loads of them on the bench eveyone has had the exact same fail most will repair in 5 mins, but they are that bad if have a new flywheel come in the washer gets welded before fitting