Shafts, bearings and circlips....

[irving2008]

The diagram attached shows a mounting block with a protruding 17mm dia shaft. Part B (dark blue) rotates on this shaft on a 17x26x5 thin section bearing (shown in purple). Incidentally the shaft is bored through 11mm to allow another unrelated shaft to pass through.

Part B's dimensions are quite limitied so I need to use this bearing. Normally retaining the bearing on the shaft would be done with a circlip but a 17mm circlip would foul the outer race as shown. I could space the circlip off with a 19mm od, 17mm id washer, but that still leaves the issue of retaining the outer race in Part B with a cover, since there would be less than 0.2mm clearance between the circlip and the cover, the inner dia of which must be 24mm to properly retain the outer race.

So how to do it? The other option I can think of is a finely threaded collar but that means cutting an internal 17mm thread in a 19mm tube, not easy.