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Take the 2-speed retrofit. With the 1.5mm Allen key release<br />
the tiny screw that will hold the shaft in place. Rotate the knob<br />
until the screw appears in the hole pointed out in this and next<br />
pic. Make sure this screw is totally retracted or it will obstruct<br />
the shaft once you insert the retrofit. Make sure you do not<br />
extract the screw completely though, or you will risk dropping<br />
and losing it.<br />
P05<br />
P06