Nae Danger, I was only joking in my above post. I appreciate the work you have put into The Disc and the time you have spent proving that it works, and I said from the start I thought The Disc 4 would be buildable.
The self righting arm on top is near enough the same as the one on top of Tengu. Whether mine works or not I dont know but so far most writers have let it work.

Hope that clears stuff up.

Great melees by the way, Mr S!