Inner Collar worn away from a heavy door. Black metal grindings you will see coated in filings. The sleeve is important in keeping the limit module working as designed. The gear above the limit module usually is the part that fails.

Gear Kit limit module gear Sleeve worn away requiring a new sleeve pressed into the assembly.

Garage Door Motor Opened exposing the gear that is damaged. You can see the black material on the lower gear collecting as the shavings fall onto the gear.

Inner Collar Sleeve that is highly important in keeping the limit module work as it is designed too.

You can seed the non round hole that looks more like a oval.

Comparison of the old collar sleeve and the new one that is needed to be replaced.

New Sleeve Pressed into the Collar assembly that shows the true circular dimension