Swapping to 5 speed, why not use an eta flywheel?

[TobyB]

dual mass is about NVH- it's a bigger harmonic balancer.

It's also an expensive consumable...

t

[Wanganstyle]

I suppose that any hunk of metal can be machined, but my understanding about resurfacing dual mass flywheels is that resurfacing them can cause balance issues. I am not certain whether this is a valid reason or not.

you can resurface a dual mass flywheel. Find a legitimate engine building machine shop local to you. I have seen mine resurface dual mass units with no issues.

A dual mass flywheel that has been re-surfaced can also be re-balanced.