The Dual has a light arm. You can always add mass to an arm to accommodate cartridges with less compliance but in the case of the Dual adding mass is not a good idea as this may affect the longevity of it's automated functions. I think AT's -OC9XML would be a good fit
Seeking mc recommendations
My main rig is a Thorens TD 318 with an ortofon 510mk2. I have a Dual 1229 completely restored by fixmydual.com. I’m looking to experiment with MC carts, but not on my main rig I’m wondering if there is a suitable mc cart for my dual 1229. I’m looking in the 200-400 range to start. What say you MC guys ?