Rada,
You've already done the first thing, which is add weight at the headshell. Second would be to either add damping fluid, or lower the paddle deeper into the fluid, or both. That doesn't do the same thing as raising effective mass, but it simulates it. Third would be a tonearm wrap; do a search and you'll find plenty of info on both commercial products and DIY solutions like teflon plumbers tape.
With that said, I did all those things to my Well Tempered Record Player arm to try to make it sound right with my Denon 103R, and it was all for naught; it just wasn't a good match. It was much better in a heavier, fixed bearing arm.
Your Shelter has a slightly higher compliance than the Denon, so your results may be different, although there's always a dispute about the actual compliance of the Denon.
David
You've already done the first thing, which is add weight at the headshell. Second would be to either add damping fluid, or lower the paddle deeper into the fluid, or both. That doesn't do the same thing as raising effective mass, but it simulates it. Third would be a tonearm wrap; do a search and you'll find plenty of info on both commercial products and DIY solutions like teflon plumbers tape.
With that said, I did all those things to my Well Tempered Record Player arm to try to make it sound right with my Denon 103R, and it was all for naught; it just wasn't a good match. It was much better in a heavier, fixed bearing arm.
Your Shelter has a slightly higher compliance than the Denon, so your results may be different, although there's always a dispute about the actual compliance of the Denon.
David