Technics EPA-500 users

I wish I could help more but I'm just getting into this arm system myself. So far I have one base and the a501G and A501L arms with another base and the a501H on the way. I will say that the base I do have did come with the rubber gasket and from what I've seen in the user's manual on Vinylengine that's the way it was meant to be installed. I haven't had a chance to install this on my tables yet but am sold on the build quality and interchangability of the system.
My only quible with the system is that there appears to be no way to adjust azimuth. Did the designers just make the arm straight to keep the cartridge 90 degrees to the surface and figure that was adequate? Maybe it is but I'm glad I have other arms in my system that do allow for the adjustment of azimuth.

The 500 isn't alone in this reguard. Some very pricey and highly reguarded arms don't allow for azimuth adjustment(Grandeeza, SME 512s). I think the flexibility of the system will make up for this potential shortcoming. With a base installed on each table, cartridges can be rotated even between tables relatively quickly and easily since the arms all have the same effective length and overhang. Even the EPA 250 should be an option(if one ever comes up for sale). I don't think any modern tonearm has quite this level of flexibility.