I rebuilt my Sondek 12 last march 1st. Without a jig, yes, it took 10 hours, but saved me a 4 hour job @ 95.00 per hr. I have a custom plinth, which is not supposed to be as good. The hell it isn't. I had a Lingo, PS and replaced it with a Herculese II. The Lingo had more torque during start up, but as for it sounding better...BS!!!! The Valhalla PS sounded no different either. You can flatten the steel top plate if you want, but the top left hand corner still needs to be tight, that's why the plates are bent a little. You may be better off saving the money for cart. replacements or try a different cart for better sound. I even built another one with an all new Vivid system.. again no difference, although I'd stick with Linn parts if I built another. Best of luck.