I don't know the effecive mass of the MG-1 tonearm. I am using a Grado Reference Sonata (6.5g / 20CU Compliance) and I am having no issues with tracking or resonance with this arm.
There is an oil damping tray which is supplied to current owners after 1 year of ownership. If there are resonances due to cartridge/Arm incompatibilities, then the oil trough would minimize any of those issues. I don't know why the manufacturer does not supply the damping tray initially but I suspect, he wants current owners to become compentent with setup and tuning before installation of the damping trough. I would suspect the damping trough in the hands of the inexperienced which would make a cartridge more vulnerable to damage. (That's an accurate description of my situation!)
The manufacturer does respond quickly to email questions. His email is accessible thru his website. He also frequents this forum and may respond directly.
There is an oil damping tray which is supplied to current owners after 1 year of ownership. If there are resonances due to cartridge/Arm incompatibilities, then the oil trough would minimize any of those issues. I don't know why the manufacturer does not supply the damping tray initially but I suspect, he wants current owners to become compentent with setup and tuning before installation of the damping trough. I would suspect the damping trough in the hands of the inexperienced which would make a cartridge more vulnerable to damage. (That's an accurate description of my situation!)
The manufacturer does respond quickly to email questions. His email is accessible thru his website. He also frequents this forum and may respond directly.