Would you risk a decent cartridge on old 45s? I've got some old singles which have seen better days. I've given them a good clean with my trusty Knosti but there are signs of wear and tear and surface marks. Would it be risky to play them using my Nagaoka MP 200? Switching cartridges is not my strong point, I had someone put the Nag on for me. If it's not a good idea to play them with my Nag, instead of mucking about changing cartridges I'd rather find something relatively cheap and cheerful just to play the singles. Any suggestions as to TT / arm / cartridge?