I agree with Albert on both points. If you want to try it out, you could get a Lustre GST-801 tonearm w/detachable headshell, and get a Denon DL103 for stereo, and the Denon DL102 for mono. The DL102 is a mono-only version of the 103. There may be other carts out there for mono only, but the Denon is the one that I know about.
Personally, I find my stereo cart to do a fine job with the mono recordings.
Personally, I find my stereo cart to do a fine job with the mono recordings.