Here is a solution posted by Beech Lister Kevin O. for his leaking Gear Crank Handle:

1. Cut safety wire remove three screws place rag under assembly to catch any dripping oil tap on assembly to break it lose from gear box place small rag in hole where handle came off--this keeps oil from draining out remove screw from handle slip shaft out from other side remove O-ring (AN6227-9) clean all parts and inspect shaft for damage on end. See Picture 1 and Picture 2

2.  Here is a picture of the groove for the O-ring do NOT scar it getting the old O-ring out. After cleaning all the parts, slip in a new O-ring, AN6227-9 or MS28775-111, using a small wooden dowel to help in placement replace the washer and spring, lube shaft and slowly insert into housing.

3. Place shims on shaft while pushing in on shaft--place handle and insert screw and nut.

4. Place some RTV around facing that fits to gear box assembly, place handle assembly onto gear box--making sure that it is pointed upwards--NOT down.

5. Replace screws and safety wire all three -- note the slight upward angle of the handle HERE.

6. Test to make sure the handle engages the gear box properly then place cover back on spar-- making sure the handle is not caught under the cover.

An easy fix to a dirty problem!