Or you could buy it new then sell it when you no longer need it! Clock Repair DVD Video - Hermle 451-050, Grandfather Clock Movement | eBay
Bought for Mother in 81 who recently passed. Something broke 30 years ago and it hasn't ever been repaired. Now ours I have removed the movement for cleaning. The reason for not working was the broken pendulum suspension spring. That looks like the easy part. Watching Todd Harrison I marked everything including mounting locations. Now a good reference for this particular movement would be very handy for complete disassembly, cleaning, inspecting, lube, assembly and set-up. Does this video cover all. Thanks
They make good chillie ... I would recommend to just peg away any debris and oil it. Then see how it goes. It's not a good beginner's project but if you have a high mechanical aptitude you may be able to pull it off. These movements are readidly available and don't cost that much. So, if you do take it apart and can't get it back in operation, you do have a solid 'fall back' option. WIllie X
I've never seen it, I would contact the author. One thing that you have going for you if you do decide to tear it down is that there are no springs to deal with.