NEW 16 teeth Green worm spindle - that the speedo cable drive attaches to.
Sometimes a little tight in the 2A3624 housing, just rotate to loosen up.
It has 16 teeth and was used on 3.4 final drives with 2A3720 drive spindle which had 6 teeth. Usually from 20.50mm to 21.12mm wide The DAM8074 worm used on the ERA Mini also had 16 teeth but yellow in colour but used a 5 tooth drive and has been used as it has about same diameter of 20.4mm.
BEWARE - There was also a different green (17) tooth drive DAM2904 which was fitted to the MG Metro with 3.4 diff and can be used in place of 22A1881 for all early minis.
Plastic worm gears used on production Mini's.
15 teeth TXD10004 black worm.
16 teeth DAM2905 green worm.
17 teeth 22A1881 clear/white worm.
18 teeth TXD10006 grey worm special size.