We improved the mother-of-all (MOA) on the Ladybug and Matchless in December 2012. Updated MOAs for both wheels have a groove in the top to hold the spring and string; there's a loop in the string that goes around the bobbin. The loops are different sizes for the two wheels, so it's important to purchase the correct replacement.
new MOA on the Matchless
new MOA on the Ladybug
Before December 2012, the MOAs look quite different and used a different spring and string for Scotch tension. Both wheels take the same replacement spring and string, which is also used on all Schacht-Reeves wheels.
For the Ladybug, the spring sat in the MOA. Spinners ran the string up from the spring, over the bobbin, down and around the small screw on the right side of the MOA, then around the base of the Scotch tension peg.
old MOA on Ladybug
The Matchless had a T-knob connecting the front maiden and a black metal Scotch tension rod, instead of a peg. The spring was attached on the left side of the MOA. Spinners ran the string up from the spring, over the bobbin, down and around the small screw on the right side of the MOA, then around the Scotch tension rod.
old MOA on a Matchless with a Bulky Flyer Plyer