Quote: I use Jessel individual shaft and have single shaft T&D's on my other motor. The Jessel's are really nice, and so are the T&D's, but the individual system is by far the best. The Jessels require alot of machine work, and the T&D's don't. That would make my mind up.
The way I understand this is that you can purchase either the individual 'paired' shaft rockers which require machining or buy a bolt-on kit. I believe T&D make individual 'paired' rockers which also require machining.