The Modern SAEC 4700 is a static balance arm whose vertical bearing is above the plane of the record. It has an archaic dangling weight for an anti skate devise and it weights a ton not to mention it costs 13 large.
There are tonearms at 1/2 the price that are superior in all ways.
The SME V is far superior as are the Origin Live Enterprise and the Triplanar not to mention any Schroder or Reed tonearm. For anti skating the SME uses a spring. The Triplanar and Origin Live arms use a lever and the Schroder and Reed arms use a magnetic system. The best arms are neutral balance and have their vertical bearing in the plane of the record. The Kuzma 4 point arms are also excellent arms. Much superior to his earlier efforts. A neutral balance arm will exert the same VTF over warps and different thicknesses of records. A Static balance are will not.
As you raise the record surface a static balance arm increases it's VTF as it tries to return to it's balance equilibrium point.