Once again a simplish job turns into a ruddy palaver

Today I finally got round to changing my push rod tube seals and when reassembling the rocker assembly, I've managed to de-thread the threaded rods that hold the rocker arms on. Really didnt feel like I was cross-threading them, no hard turns, it was all really smooth, which is a bit bizarre, but they are definitely threaded

Any tips for getting the spinning nuts off, and if i manage that, can i get these rods out to replace them, and if so, how?
Thank you my fine fellows and ladyfolk.
Any help massively appreciated as always,
Billy.
Oh, and 2.0l Aircooled
