On 4/25/2010 00:30, Richard J Kinch wrote:
Searcher7 writes:

Is any gain is speed or possible accuracy really worth the cost that
these go for?

One problem is that they are longer and thus further out from the
headstock.

That is not universally true. My Kalamazoo Chuck's Zero-Set mounting
adapter threads right up to the boss on the spindle. Once the proper
thread form was achieved, it spun on like a bank vault closing.