How to change effective mass of a SME V.

Effective mass is the summation of the mass at each point of the tone arm times
the distance from that point to the pivot. In other words, it is an integral of the
mathematical function which describes the tone arm, the headshell, the cart,
and the counter weight. Since that mathematical function is unknown to us,
it is very difficult if not impossible to calculate the effective mass accurately.
Perhaps other members with better math skills can come up with a way to
estimate that.

One way to find out how much more weights are needed is by trial and error.
You can incrementally add some weight to the headshell, make all the VTF
adjustment necessary, and play a test record to see if the resonant frequency
falls within the ideal range.

Dear Clarkie: My advise is that you mount that cartridge and hear it, in this first " step " don't worry about tonearm effective mass, this factor is important but not the only that define the tonearm/cartridge quality level performance.

Btw,I see at your system ( sorry is out of the thread ) and IMHO you can improve in an important way your analog rig performance if you take your AS TT out of those " terrible " own footers. You can see at my system in that same TT, something similar that you can do will help you.

Regards and enjoy the music,
Raul.

Won't that cause tracking problems on the slightest warped
records? What I'm talking about is the stylus shank bending
more having to move the extra mass even though it's balanced
perfectly.Just a thought.

No, the low compliance cartridges REQUIRED more mass to work effectively. Low compliance means that it takes more mass to bend the stylus a given amount. When you have insufficient mass the stylus will not properly follow the groove. Imagine a very stiff shock absorber that is intended for a heavy auto. Put it on a light auto and it will hop from bump to bump. The tracking weight will be the same but if the arm has insufficient mass it will be easily deflected, the more massive arm will absorb a warp [ for example] more easily as it will allow the cantilever to flex to accommodate it. So the more massive arm works better precisely because it allows the cantilever to move more, the lighter arm will allow the arm to move rather than the cantilever.