When I purchased my Singer 66 Red Head the lever that lifted the pressure foot off and on the fabric worked.
I tried to clean it and it became very loose and then would not lift the sewing foot.
I have taken the insides off the left side of the machine to clean the head.
When I finish the cleaning and re-assemble I hope the foot goes up and down.
Do you know whan I did to dis-engage the thing?