Thanks for the credit in the OP @elliottbnewcombjr, but I should note that whilst you might be the one that is 74, I am not, being a mere youngster of 65!
Two tonearms? I had an expensive journey in that regard. I started it with an SME 10 turntable and an SME V arm, and I was very happy with both. I’ve written before that it sported a London Decca Reference cartridge and I was completely happy—until the Reference needed to go for a rebuild, and John Wright announced his retirement. So I went on a cartridge journey and ended up with several candidates for when the Reference might finally die and be unrepairable. While there is now a new owner and the Reference might be serviceable in the future, that was not the case at the time so I decided I needed to use the other cartridges to spin out its time with me.
There was once upon a time the option of adding a second arm to the SME 10:
There’s a sad story to that, though. The maker was an SME dealer, and when SME saw what they were doing they took the dealership away from them, so they stopped making this useful accessory. So I bit the bullet and bought a second SME 10! Used, of course, and with the M10 tonearm, which is much like a 309.
Even so, when the Reference came back, I still wanted to house the Nagaoka MP-500 that sound so good, and I also had a Grado Statement 3 and a SoundSmith Sussurro MkII, plus an Ortofon Cadenza Bronze.....what to do? I ended up ordering two tonearm pods from this place:
https://www.acoustand.co.uk/products/tonearm-pods-for-all-applications-premium-product
and mounting two Rega RB330 arms on them, as I cannot buy any SME arm except for the M2 (which now costs more than the SME V did!) So I can run the Reference, and the MP-500 on one table, and the Cadenza Bronze and a Cadenza Mono on the other.
The second photo does not show one other necessity: the Cadenza Mono will not balance with the stock counterweight of the RB330 (there’s a .50cal lead ball taped on the back of the arm in the photo, but that arm now sports a 150g Groovetracer counterweight. I’m happy. Some say that tonearm pods are a horrendous nightmare, but these sit on points on top of a 400lb oak chest, and the differences between the cartridges are clear, and I can not say the MP-500 or the Cadenza Mono are in any way hampered from showing their metal by their homes.