Having difficulty installing Grado cartridge on a Rega turntable


I'm trying to install a new Grado Sonata 2 cartridge on my Rega RP3 turntable. I'm replacing the Grado Sonata 1 cartridge which was installed by the dealer who is now inaccessible. I understand Rega and Grado are somewhat incompatible. I'm having all sorts of problems installing the new cartridge and need help. It doesn't behave like the old one.
Does anyone know of a Rega service person in the Long Island, New York area?
128x128rvpiano
Audioden is in Lake Grove.  If one's a p-mount a the other is not, you need something...
stringreen4,146 posts12-28-2016 5:25amwhat is (are) the problem? just curious.
@stringreen ,

Sometime people can be born with 2 same hands either 2 left ones or 2 right ones. Either way, that makes it more than twice as difficult to apply all kinesthetic or hands on activities even having the fact that there are more than plenty of youtube videos on how to set-up and hook-up cartridge to non-sophisticated tonearm. 

 

After checking proper angle, anti-skating, proper stylus pressure and leveling the surface on which the turntable is standing, an oddity occurs.
At the end of a record the tonearm shoots toward the middle of the disc and sometimes on to the label.
Also, there is evidence of mistracking
Make sure the arm isn't hitting something in its travels, binding on something....sure sounds mechanical to me.