Bodog wrote:Dang man, the hits just keep coming. I keep this lubed with fireclean which, ime, is better than frog lube.
Over the past week I've been carrying the mantra and any free time I've been able to I've been flipping the knife trying to smooth it out and free the action up. As it's smoothed out I noticed the detent kept getting lighter and lighter. I just thought it was gummy crap getting stuck in the detent hole. Today it seemed really bad like there was no detent left at all (and cut myself because the blade opened in my pocket) so I took it apart and found this, the detent ball is completely worn down to a flat surface. To say it's frustrating is putting it lightly. But since I opened it I have no warranty so I'm out of a knife. This wasn't just opening it to tinker, this was to identify a problem that wouldn't have been identified by spyderco, as shown by dogrunner. I kind of want to throw the damned thing away. Anyone want to buy a slightly used mantra?
Can anyone confirm if the detent ball came slightly flat from the factory?
I don't know what steel they're using for the detent ball but if the grind lines in the blade are capable of wearing the ball down within a week of trying to free the action of the knife, something is wrong with that too. Frick man. Disappointing. There's only one word at this point. Failure. Why the f!&# didn't this mantra work right? It's such a great overall design.
My first thought looking at this pic is "holy **** that's a lot of lube!" Something with an open bearing like that (or even a bronze washer) should be lubed *lightly* with a lube that doesn't migrate and doesn't attract dirt...
On the subject of lube based solutions, adding oil to a gritty detent ball is usually a recipe for an even grittier detent ball once the knife has been in your pocket for a few hours. Often the culprit with detent grittiness is crud in the recess that the detent ball seats in on the tang, lube can't remove that, only disassembly and thorough cleaning can fix it.
I for one am not a fan of ball bearings in knife pivots, they *are* sexy and high tech, but they're too easy to get grit in and they concentrate side-load forces into a small group of hot spots, compared to the large area presented by a solid washer with the same footprint. My personal preference if I owned one of the offending knives would be to retrofit a set of appropriately sized PB washers in place of the ball race assemblies, It would be cool if Spyderco could offer that as an option to people who are having issues with these knives, but this may be a perfect opportunity for the aftermarket... model specific bushing conversion kits, I'm sure somebody could make a few bucks off of those.
It'll be interesting to see what the final solution from our favorite knife brand winds up being!