I'm sure it is totally unintentional, but the original post can be taken as a kind of troll.
http://en.wikipedia.org/wiki/Troll_(Internet)

VERY basically the question being asked is:
I have a part that is half worn (=half new?), should I use it.

Argument is almost guaranteed to follow. See what I mean?

I am not trying to insult Dmitry in any way.
I am sure he just wants to know what to do.
_________________
[color=#808080][size=9]Yes,.. I too know how to waste Time and Money,...