Originally Posted by Kitzone
I inherited a Singer 15-91 the other day and I am a little baffled. Attached to the pressure relieving thumb screw is a "Revco" release button. Has anyone else seen one of these and do they know the purpose?
Yep I have a bag full of them right now!! Revco was the aftermarket kings in the sewing industry. They had items like your "Quick Release" presserfoot tensioner to the "Reverse Switch" on the machines that did not have the back tack feature.
I happen to love them because after I use a machine I just hit it take the tension off of the presserfoot and Store the machine. It keeps the spring from loosing any preload or strength while its sitting around doing nothing. In fact I always take the pressure off of the presserfoot no matter what.
Billy