The ball bearings in the pinion gear assembly carry extreme load. In some rare cases the rubber seal of the 13×19 bearing which is installed in the bulkhead may become dislodged. To prevent this we suggest removing one seal on the inner bearing as illustrated.
1) Use a hobby knife and remove one seal on the bearing.
2) Install the bearing with the removed seal facing inside the housing (see image).
Please ensure proper servicing and regularly lube the bearing with grease. We suggest to use the HUDY Bearing Grease (#106220 Grease; #106221 Grease – Extra; #106222 Grease – Premium).
Source : XRAY