Mainspring was a short-lived offshoot of music publishing company Woolfsongs. It was run by Eric Woolfson and managing director Bob Britton, and according to Billboard magazine of the 4th of December 1976 it was going to concentrate on singles. In the event it only issued four of them, in late 1976 and early 1977, using an MSP-000 numbering series; none of them are commonly found, nowadays. The layout of the label was such that perforation for dinking tended to obsure the artist's name, as can be seen in the second example shown above. Distribution was by CBS. 'Music Master' lists the third and fourth singles as coming out before the first two, which is slightly puzzling.
Copyright 2006 Robert Lyons.