I got a really lovely chrome single slice from...i think the 30s or 40s on ebay for $30. work required: completely dismantle. soak return coil spring assembly

I got a really lovely chrome single slice from...i think the 30s or 40s on ebay for $30. work required: completely dismantle. soak return coil spring assembly in mineral oil. make a new carbon contact by cutting down a motor brush replace cord with new cloth 3 conductor (plastic didn't look right) 10 years later and still works perfectly.