I know Pros & Cons, but…
…when using it works pretty fine in case you are going for heavier carts than the TSD15 or other “Tondosen”.
here we see an Ortofon A90 mounted in a special & modern EMT headshell.
A Fidelity Research FR-7f cart with diamond connection also needs more weight. You can mount a different counter weight at the rear of the RMA 297 or you are using just this little device.