Replace roller rubber on HP 9825 tape drive

[Tony Duell]

> 
>    The really ingenous part is that the belt attempts to rotate the take up
> spool about 10% faster then the other spool. That's what tightens up the
> tape if it ever gets slack.

How does that work? All points on the belt move with the same speed, the 
belt drives the outside of the 2 spools, so the surface speed of the 
spools must be the same. That's the tape speed. I don't see how it can 
move the tape faster on the takeup side.

-tony