Originally Posted by Dan
Seems so opposite of logical. Vibration can not be isolated, just absorbed. With out damage at the least. When I first got in to this I did the nobie thing and wrapped the seat and down tube with old inner tubes. It just allows for more vibration like the beautiful Riddly mounts.
Here is a link to a book that will teach you all about vibration isolation.
I guess I misunderstood, I thought the lead was being used to isolate the vibration. From the photos it looks like the lead was used to create a better fit to the frame. It's a great solution to take up the radius difference between the engine and the frame...provided that the radius in the engine is larger.