Replacing LP12 arm with Well Tempered Simplex Arm

What tonearm & cartridge is currently fitted to your  Linn.

In my experience 2nd hand tonearms can be problematic, you never know whether they have been mistreated, and are in good order.

I would suggest you get your Linn serviced, and see if you can afford either the Ekos or new Krane arm made for Linn by Clearaudio. Avoid the Project arms - they are junk.

Budget killer in my experience for a non Linn arm would be the Audiomods 6 tonearm. Easy to set up, VTA on the fly and great performance for the money.

I set one up on my old Platine Verdier when I sold it and it held its own against my regular Dynavector, Naim Aro and FR64s tonearms on the same deck.

I have set up Well Tempered arms on the Linn, its ok, but fiddly to set up and I dont think the performance on a Linn is very good for that arm.