In article ,
Chris Bacon wrote:
It's possible one make uses tighter production tolerances. Ie, checked to
be fully up to spec. The other - sort of seconds.

Aha, identical but different. Well done!

It's certainly the case with car tyres. Check out a new car with brand X
tyres and see if there are balancing weights. There won't be. Buy the same
brand afterwards and fit them to the same car and they'll need balancing.

Get the point?

--
*Forget about World Peace...Visualize using your turn signal.

Dave Plowman London SW
To e-mail, change noise into sound.