TP20 Stylus rack questions

[[Ro...]]

Hi everyone, I have some basic questions I'm having trouble finding answers to. I'm using an Eclipse with TP20 modules and Calypso 2016, so I'm on an older system. Googling around and whatnot, I'm only finding answers relating to newer systems and non-TP20 probes.

Sorry in advance if I use some improper vernacular/jargon, I'm not exactly formerly trained on CMM operation. I was shown enough to get going and have been largely self taught thereafter.

My first question is, with this system, can I have 2 separate probe racks? We have a 6 probe rack that's been in use forever on this machine. We also have a Nikon vision system with a 4pc rack, and were recently told the machine can only use 3pc, not 4, so I'm looking to steal that and put it on the Zeiss if possible as we have a few extra probes lying around that we load and unload manually when needed. Not totally ideal. 

-Follow-up to that is, I'm not quite sure how to locate the rack if I were to move it. The videos I'm finding are the newer systems with an XXT head, and the tool holders seem to have a countersink in them for the software to locate the rack automatically.  Our rack doesn't have anything like that, and when I previously tried to follow the steps in Calypso, I was obviously misunderstanding something, because it wasn't working properly. Someone had crashed into the rack which moved it slightly, and the machine was having trouble loading and unloading  probes. After my failure to re-align it, I ended up moving it by hand and going trial and error...I think it would be best I learn how to do this properly!