Marco pointed to the best way to get everything 103 can give - Denon 12" tonearms. I haven't heard 103 before I heard it in DA-308 which is a later model built along the same principles as DA-303, just with better engineering. Whoever likes 103 and sticks with it, should try to find one, those arms are not that costly as Fidelity Research tonearms.
Gordan.
Speakers: Oris Swing MkII
Amps: Thomas Mayer 300b/ Hiraga La Maison de L'Audiophile 20
Preamp: Silver AVC by eng. Ferenc Lazar
Phono Preamp: Shishido LCR by Solaja Audio
Decks: Garrard 301 Martin Bastin reworked/plinthed with Fidelity Research FR64fx
Garrard 401 in eng Ferenc Lazar solid wenge plinth with SME 3012/2
Cartridges: SPU Spirit/ Koetsu Black revisited by eng. Salai/ Miyajima Shilabe
Step Up Transformers: Tango MCT 999/ Ortofon T-5000/ Lumiere SUT
Digital: Shigaclone by eng. Ferenc Lazar with Lampizator Amber II
Wires: of sufficient length