AYRE K-3 - Manual (Page 13)

The phono gain and loading can be adjusted by your
authorized Ayre dealer. However, for those owners that
prefer to perform this task themselves, the following tools
are required:
5/64" allen wrench (supplied)
Small screwdriver - 0.080" to 0.100" (2.0 to 2.5 mm)
Tweezers, or small needle-nose pliers
Changing the phono gain and loading resistors
is comparable in complexity to installing a
phono cartridge. Do not perform this task
yourself unless you are completely comfortable
with it.
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