I took my 301 which I picked up at a tag sale for 30.00 to a Singer Repair person we have locally...He knew everything and anything abt Vintage machines...He did replace the old pedal...told me everything abt the machine, showed me, told me what it needed and gave me a price before I left it...in writing with warrenties on what he did.
I'd take it somewhere else...never leave anything without a price first. He can ask for the moon and hold your machine hostage until you pay.