There's a sleave on the axle that spaces the two bearings. It's supposed to be a very tight press fit, which should keep the axle from sliding. But if it's slightly too big, the axle could slide through the bearings.
Peter Jon White
Peter White Cycles
24 Hall Rd.
Hillsborough, NH 03244
603 478 0900 Phone
603 478 0902 Phax
http://www.PeterWhiteCycles.com
> Has anybody ever had a Phil move sideways? It happened on two Jack
> Taylor tandems (both within CR timeline!), rear BB. We noticed the
> right-side chainrings were grinding on the chainstay, grinding hard!
> In both cases, the lockrings were VERY tight, but not glued in with
> Locktite. Same BB, both times, swapped from one bike to other. BSC
> thread. Drivetrain is standard: from the offending BB, the right
> crank has a chain to the rear wheel, left crank chain to front
> cranks. It happened within 500 miles of installation.
>
> Is it a Phil thing, or a Taylor thing? I replaced the BB with a
> Ritchey (fixed cup), and no more problems. But I'd like to reuse the
> Phil, so I want to figure out what happened...
>
> --
> Jan Heine, Seattle
> Editor/Publisher
> Vintage Bicycle Quarterly
> http://www.mindspring.com/
>
>
> Dan;
>
> Another nice thing about the Phil is
>
> snip
>
>
> allowing the whole assembly to move side to side. This not
> allows you to adjust for a perfect chainline
>
> snip
>
> Bob Hovey
> Columbus, GA