That's a bit of a generalization, Mikael ... there is no movement in the TK4s, U2s or U4s I have, or, for instance in any of the Japanese Spyderco lockbacks I have.
None. Not a bit.
Anyway. Its not the flaw that's the issue. Knives have flaws. It is Fallkniven's response to the flaw that is the problem.
As long as we are talking about the pivothole and the pivotpin, I understand perfectly what You say.
All my Japanese folders, have this pivothole play, but none in the backlock or linerlock.
Obviously there's a difference in our respective experiences with the Japanese folders.
I have dissasembled my U4 and have had a check.
I'm sure of that the pivothole is a little bit larger, than the diameter of the pivotpin.
The lock is perfectly solid and tight.
Anyway. Its not the flaw that's the issue. Knives have flaws. It is Fallkniven's response to the flaw that is the problem.
As I understand Your issue with Fällkniven, You were asked to send the TK3 to Fällkniven HQ in Sweden.
You choosed not to, instead You returned the knife to Your Dealer and got Your money back, right?
As I see it, the Dealer should have received the knife back and given You a new knife in return.
He should then have shipped it to his Distributor.
The Distributor should have shipped it back to Fällkniven under warranty.
Then Fällkniven could have inspected the knife.
If it had a flaw, send it back to the maker in Japan for a replacement and send it back to the Distributor.
The easy way out for the Dealer is to say, You have to talk to the Fällkniven HQ Yourself.
Here's where Your story gives You a consumer trouble!
Regards
Mikael