I put the 8 bearings which fit with 1 empty space. 8 came out of both sides as I had the wheel on a tablecloth. I used a calipers on the cone depth and the races and figured the inner one was correct . It does roll OK but now I think it may be screwed up. I tried several tools the Park FR-5 was a hair too small even after cleaning out the hub grooves real well, I even tried tapping with hammer as a bike mechanic suggested as it was SO close. I have 3 other tools that are close but no go. I am wondering if the FR-1 would do it. The hub says Shimano YB and Singapore. The 34 tooth cog says MB HG 40-7 SIS az 34T YC. It is original on my Giant Mt Bike year 2001. The specs are on bikepedia but it just says rear cogs not whether it's a FW or cassette.
http://www.bikepedia.com/QuickBike/B...lder&Type=bike