Sorry - I have double post on this issue. Whole story is here:
http://classracer.com/classforum/showthread.php?t=53835
It turned out to be Jerico Shifter. I made this post on Comp Forum in hope, that there is more Jerico 5-speed users online.
I have quoted a complete shifter from G-Force. At least they have common website with LONG.
Problem is still there and material has been added(weld) / removed / added. No results yet.