mastercb wrote:** More rigid design of gearbox cover
Uh, the original gearbox cover was sturdy enough.
mastercb wrote:** Moved position of gearbox screws (better sealing effect)
That's not where the pet hair is entering..
mastercb wrote:** Introduced washers on some (not all) gearbox-shafts (for better shielding the shafts against dirt)
Against dirt? Uh, dirt isn't penetrating into the gearbox. Pet hair is.
mastercb wrote:** foam plastic ring on the motor drive shaft (as known from black CHM)
Yea, nothing improved there..
mastercb wrote: ?? possibly returned to a no-ball-bearing-design (as known from red CHM) (not 100% confirmed) ??
'thinks' they know what is causing the issue.. Seriously iRobot
!! Make it mandatory
to have your engineers come over here and read what is causing the CHM issues. Quit Guessing!!!