BYOC Spring Reverb Instructions Manual page 25

FOOT SWITCH SOLDER LUG DESIGNATIONS
Step 3: Wiring the foot switch.
Make a jumper between lugs 3 & 6 from clippings from the resistors.
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Simply use your needle nose pliers to make a U shape & insert into lugs
3 & 6, then solder.
Cut a 1.5" piece of wire. Strip 1/8" of one end. Strip 1/2" off the
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other end. Tin both ends. This will be used to connect lug/eyelet 4.
The longer stripped end will be used to jumper lug 4 to 9.