center pinning question

["Rafael M. Huberman Muñiz"]

Allen,

I think that the problem is with something in your repinning  
technique. Either is your device for pushing the old pin out (punch,  
pliers, etc.) or the way you push the new one in, or the things you do  
in between.
The first one: you have to be very careful when you push the pin out.  
The first thing is to note if the old pin has rough edges (one or both  
of them) due to technicians that cut both sides of the pin after  
inserting it or, worse than this, technicians who file the end of the  
pins so you don't see the rough cut but a smooth surface. If there is  
only one side cut then you have to push the pin out by the clean side  
being careful to put your tool right in the middle and realy straight  
so you don't scratch the bushing. It's very important not to go all  
the way through with the tool because you will push the bushing  
inwards tightening it the same way that the tool for tightening key  
bushings works. This depends on the tool you use… If the pin has cuts  
on both sides or it has been filed then whatever you do will damage  
the bushing…  So, pushing the old pin out can make damage to the  
bushing that will result in tightening temporarly the bushing. Notice  
that I said temporarly. if you put the same size of pin after a few  
weeks it will be loose as it was the other one, or even worse if you  
loosed the bushing  with a reamer or file for fitting the new one… If  
you are repinning there is no way you will put same size pins, it have  
to be at least one size up.
I won't talk right now about sizing up the new pin, but once you got  
it right then you have to be very careful tu put it straight and push  
it with a straight surface so you don't tight it when you press at the  
end (there are some tools that have an indentation for the pin and can  
work as the key bushing tightener tool).
So my assessment is that there is no wore in the pins but some kind of  
swallow of the bushing while in the process of repinning.
To test if something like this is happening just take one of your  
tight repinned piece and apply one drop on each side pf protek center  
pin lubricant and wait a few minutes and balance it a few times and  
you will notice that it is loose. If this happens you need to put in a  
thicker pin.

Rafael
_________________________

Rafael M. Huberman Muñiz

ArtePiano
Jazmines #309, Col. Reforma
Oaxaca, Oax. CP 68050
México
+52(951)5152629
044(951)507-0960






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