So Lets Do The Math, $45 for a service call, $65-$85 +Parts, where they actually do anything. This unit can easily be changed out by the "Do It Yourselfer". Use the Money You Saved to take your Wife or Husband to Dinner, it's a win win:)

Replacement Gear and Sprocket assembly for ALL 1984-current garage door opener Compatible with ALL fail safe units from Liftmaster, Chamberlain, Craftsman, Sears, Master Mechanic and Wayne Dalton.

If your using a Liftmaster Chain Drive Opener on a One piece Wooden Door, it is recommended you use the Dual or Double gear as a replacement.

Includes metal sprocket assembly, plastic worm wheel and Lubriplate grease Compatible with garage door opener models: 1345, 1355, 3265, 3245, 3255, 2245, 2255, 2265, 2265-267, PD210, PD212, PD610, PD612K, 1200 Series, 1240, 1245, 1245-266, 1246, 1250, 1250-266, 1255, 1255-166, 1255-266, 1256, 1260, 1260-166, 1260-266, 1265, 1265-267, PD752, 7420, 140, 150, 240, 350, 450, 550, 1000, 1100, 1200, 2000, 2100, 2200, 4000, 4001, 4100, 4200, 5000, 5100, 6200, 700WHC, 701WHC, 710WHC, 711WHC, 7200, 7220, CG40 and more. Not all models listed.

Original manufacturer replacement part