Another problem: the black rubber belts with the square cross-section. I have noticed with these belts, they loose elasticy over time and become fragile. Since they are used or under stress, it's impossible to use them at all without breaking them, no matter how careful I am.
I've seen this with belts used by mail as well, but still I don't get why the square ones were used in for example 6668, when the round ones were already released. I don't think the round ones have this problem.
Edit: I have found some round ones have the same issue. I've checked my 8868 (1994 copy), and I'm afraid the belts won't be working for too long. I haven't seen damage on the belts of 8480 and 8485 yet.
Edited by Richie, 23 July 2011 - 12:15 PM.