Just thought I'd drop this post as there seems to be a lot of misinformation on various sites about the stock dual mass flywheel.
Yes you can resurface it! No you can't just do the normal surface turn it will need to be jigged and surface ground, a bit more tedious and costly job and most shops aren't equipped to do this job so it will have to be sourced to a competent machine shop.
This does NOT shorten the life of your replacement clutch or increase the distance between the pressure plate and flywheel as the morons of the internet would have you believe, the entire surface is ground including the clamping surface.
You do not have to have your flywheel resurfaced when replacing the clutch. It's a good idea to at least hit the surface with a high grit sandpaper on a block to deglaze the surface, then clean with brake clean and slap it back together.
I just had to clarify as I was finding so much misinformation regurgitated and accepted as fact by keyboard technicians.