If you are new to mechanical musical devices, and have not recovered
bellows, I suggest you hire the work done by a professional who is
experienced in this type of work.  It is not a big job.

Old bellows material can look perfectly good, yet be full of small
holes.  I am sure that the pads covering the reed cells are also in
need of replacement.  Do it right the first time and you will be much
happier in the long run.

Bruce Clark