[R-390] (no subject)

[wli]

That is great info. I had no idea re the history behind these weird screws. It all makes sense thinking as a *mechanical engineer*. I guess the increased cost of manufacture prevented them from being a universally accepted fitting.... too bad for the rest of us.

That said, all the earlier posts cautioning against overtightening can not be ignored. I use a straight one secured in a small diameter holder, so I do not over-torque.

Thanks

W. Li