I'll just add that the Holbo makes it very easy to bolt a cartridge in, even if it needs separate nuts. The tone arm is a parallel tube, and it can be rotated about its long axis so it faces sideways or even upside down. I set it sideways, and could position the bolts, washers and cartridge without having to physically hold anything in place. From there getting the nuts on was easy.
The SME 3009 fixed head-shell tonearm, on the other hand, has to be completely removed before a cartridge can be safely installed. Because mine is so old, the connectors are fragile. I do have a custom-made wiring loom for it but that requires gymnastics to get the wires through the tonearm. Something for another day!

