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Like all the components of the cooling gills mechanism, these control rings suffer from being ignored.

The bore & threads of the control screw holes get worn & stripped, while repairs are often unsatisfactory since the factory part was made of cast material.

This new ring is machined from billet 7075 for strong threads and vibration resistance.

TYC’s hardened control screws won’t develop flats the way the regular carbon steel factory ones do. The photo shows one that’s been in place 500 hours and is only starting to show surface fretting.

The factory bearings were not the sealed type, thus open to dirt & grease in the airflow- not very easy to service or replace either.

TYC’s assembly includes three new sealed bearings with new pre-engaged tab washers, new cam screws and new M4 locknuts.

The cam adjustment screws have a pointer machined into the hex head. Start adjustment with the groove pointing away from the center. Rotating the hex head in either direction will move the bearing inward, reducing the play against the bearing tracks in the axle ring.

The area where the control lever goes is undrilled because the levers for Yak and CJ have different bolt spacing.

Think about how much time you have spent in the past servicing this assembly on your plane.

Not much, right?

Go with a new assembly and rest assured you can keep on ignoring it for many years to come.