@technick
There’s nothing wrong with the stock tonearm. It’s actually a very well designed arm and was made specifically for that deck.
Nothing wrong until you want to upgrade it
You’d be better off and notice a much larger difference by rewiring the tonearm with a higher grade of wire like Cardas, Audio Note, etc.
Some vintage tonearm are superior even with old stock internal wiring for some reason.
Do you think the new tonearm wires are not good even in GR or G series ?
Also look into a fluid damper from KAB.
There’s even a review of it on Audiogon.
The new arm designed for use without fluid damper, actually i have those dampers on my old technics along with cardas wiring. I prefer the arms without fluid dampers designed like KAB (with open "bath" to collect dust). I think the fluid damper is not necessary, at least some of my favorite tonearms does not have fluid dampers at all and sound fantastic, Reed 3p is one of them (completely different design philosophy).