J Hubbard, your profile page lists you as Manager USA Products at Buck. Perhaps you can clarify some things?
The discussion of bushings came up with respect to Buck knives that develop vertical play with hard use. See:
http://www.bladeforums.com/forums/s...orical-review-of-Buck-110-pivots-and-bushings
From that thread, it appears that the bushings changed from being integral to free floating and changed from steel (colored) to bronze (colored) over the years.
There is also discussion as to whether vertical play has more to do with worn bushings, worn pivot pins or both.
I donated my 482 and 486 to Jeff last week. The 482 is quite loose vertically and that happened within a year. Do I abuse my knives? All I can say is that I use them as hard but not harder than my $15 Opinels, which don't develop play. Jeff said he wanted his team to be able to inspect the worn knives to see what was failing. Perhaps you can talk with him?
Any insight as to why some Buck knives develop vertical play and some don't would be really helpful.
Thanks,