Hi Garibaldi, First I would try a couple of things. First make sure there is no problem with the bearings. When you move the arm around does it move smoothly? Then make sure your turntable is perfectly level. Next double check your VTF (vertical tracking force). The VTF for that cartridge is 2.5 grams +/- .3 grams. If you don't have a VTF scale you need one.
Another issue is the effective mass of your tonearm (9 grams) is not ideal for the compliance of your cartridge (5 x 10^-6 cm/dyne at 100 hz). I would look for a way to add mass to the head shell of your tonearm or use a different cartridge that has a higher compliance. To add mass to the tonearm head shell you could try using some blutack and a penny or nickel. If that works you could try to find a cartridge weight designed for use with your Denon 103.
Hope this helps.
Another issue is the effective mass of your tonearm (9 grams) is not ideal for the compliance of your cartridge (5 x 10^-6 cm/dyne at 100 hz). I would look for a way to add mass to the head shell of your tonearm or use a different cartridge that has a higher compliance. To add mass to the tonearm head shell you could try using some blutack and a penny or nickel. If that works you could try to find a cartridge weight designed for use with your Denon 103.
Hope this helps.