English word for that?

[Gregor _]

I went to the Frankfurt music fair yesterday and scrolled through the Piano 
Nomenclatur book by Schimmel. There I found a German word which I never 
heard of, the verb "schiebern". I know what it means, but I usually say "to 
remove schieber" (schieber as a noun). Funny: in that book there was no 
english word for that, the only one translation was the Italian one. It 
means the following:

When you move a few hammers to the strings by hand and you see that one 
hammer has a left-hand (or right hand) twist so that the middle of the 
hammer does not hit the middle of the 3 strings, one should regulate that. I 
mean that the hammer makes not only a forward, but also a sideward movement 
("schieber"). In this case one takes a piece of paper and adjusts it under 
one side of the hammer butt flange. Correction tape for type writers does a 
good job for that. The result is that the hammer is on the correct course 
again. Once I visited the Renner factory and I saw some guys who did that 
job in piecework. I never so that job done so extremely quick and accurate.

How do you say it on English?

Gregor

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