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Shaping Steinway hammers without any stiffening agent is almost impossible to do accurately. Also, you have to take off the outer layer of lacquer after it has dried.

those hammers look really strange, as if the felt strip have moved a lot in the press.

The felt recovering shop explained me that was the main difficulty when gluing the felt, that is why the sheets are folded in an heavy press with a "sabre".

whenever the strip does not stay centered they use corrective measures before gluing.

It is probably less important on hammers that are due for hardening anyway.

but may be the reason why the crown is placed 2-3 mm in front of the apex in that case.

The result is all that matters of course