I'm trying to take off the stock seat rails from the recaros so I can reuse them to mount some sparcos. Problem is the rails are held onto the seat by 4 allen bolts that will not loosen for even the nicest allen wrench. Anybody ever gotten them off or are these damn things welded to the seats like they feel like?

 

There's a thread-locking compound on them. It takes some effort, but the do come off.