I have a 500B garage sale find that I picked up probably 25 years ago just because it was really cheap. I finally decided to rebuild it. I heard about a few kits to rebuild them and found the Metalbone kit. It came in yesterday and was pleasanly surprised with everthing included. A copy of the factory service manual, schematics, large color photos, updated power supply and good instructions. I haven't done much electrical work in a lot of years but I have no doubt I'll make it through it just fine with everything he includes. Just passing it along for those temped not sure about diving in. This looks like a pretty well thought out kit.