Did I do a good thing or not?

So you like the Shure way better than the Acutex LPM320STR III?

Manual is readily available on Vinyl Engine and elsewhere. Dover, I set mine up per the markings. That’s pretty much according to the manual, but your added suggestion on how to check for balance by blowing on the wand was new to me.

Dover, thanks for that tip. I’ve got two 505s and a mint 501. The owners manual is a bit vague on positioning that rear mounted puck shaped counter weight.

Give it a week or at least several hours of listening before you make a judgement. All new audio gear is a rose at first and then after long hours of listening, sometimes the bloom is lost.

If you prefer the Shure to the Acutex, I’d be surprised. But I’m interested to know.

I too hope you enjoy the Shure, despite my pessimistic comment.  Pay no attention to Jason, who even got the inductance of the Shure wrong.  He stated it's 400 microhenries when in fact it's 1000X higher than that, at 400 millihenries (actually, Shure say 500mH).  But the good news is inductance is only one factor that might partially affect transient response.  Other factors (moving mass, compliance, etc) are actually in favor of MM and MI cartridges over MC cartridges in terms of transient response.  Also, as someone else pointed out in another thread, inductance acts through hysterisis, which is only a factor for certain coil structures. Back in their heyday, the Shure V15s were known and advertised for their tracking ability.  And indeed they measured superior in that regard. Tracking ability also is a correlate of transient response.  So, listen for yourself.

I don't get why you would ask AFTER having made the purchase.  You will be the first to know whether you made a good move, once you have auditioned the cartridge.  Like "secretguy" said, I too never thought the V15 series were  much better than OK.  But it was a phase that everyone went through in the 70s and 80s.