Optimal fit and sound reproduction
If your tonearm has a standard headshell or a cartridge mount, then step up to optimal sound reproduction with OMs. A glance at any of these cartridges will reveal Ortofon's answer to perfect tonearm matching. Ingeniously tucked into the top of the mounting bracket is a tiny, removable weight plate.
If your tonearm is a standard tonearm, just leave the weight plate. If your tonearm is one of the low-mass types, then simply remove the weight. The mass of your OM cartridge is now a mere 2.5g.