Rockport Sirius III
The American Altar, but the Arm wire inside is so stiff that the Arm can not
track the inner 3 tracks properly, it skips, the only way out is to use a very
heavy cartridge, ..
I can promise you that is not the case! As mentioned in the other thread, I am sure the Sirius III you worked with was either damaged or not set up properly.
I have 2 Rockport 6000s, which share the same wire/arrangement as the Sirius III arm, and I have never encounter problem with stiff wire in the past 10 years. I have used both relatively high and low compliance cartridges on them with absolutely no problem with tracking.
Granted, you may not like the sonic performance of the Rockport, but saying that it can't track the inner 3 tracks properly is absolutely not true.