MGA/MG ZB Magnette Window regulator repair.

The sprocket on my MGA left hand window regulator has damaged teeth on the gear sprocket. I used a rust-frozen Magnette regulator for a donor gear sprocket. I tried to dismantle as carefully as possible so I could re-use everything.  The pivot pin with a "swagged" or hard press fit to hold it in place was tricky.  The small tabs were prone to break, this loss of metal necessitated spots welds to hold the pivot pin solidly. The pictures give some insight on how it is done.  There is a page of pictures on Barney Gaylord's mgaguru site too.

ZB Magnette donor regulator, pivot pin pressed in place.

Hole for swagged pivot pin. Pivot pin was tapped loose carefully
and was reused. Spot welds to hold it in place.

Magnette donor, it was rusted solid, but the
sprocket was good.

The chewed up MGA sprocket on top, the modified
Magnette sprocket on the bottom.

Welded pivot pin, pop rivet as original also seen.

Spot welds. 

Tabs spot welded, just to be sure.

Time will tell how long this lasts.  The cold and wet weather is holding up most work now, I hope to be driving before summer.

22 Dec 2015  The spot welds I made didn't last through the initial attempt to re-install, so I had a real welder fix it and all should be good now.  The windows are in and working all right for now.