Aside from playing a record, you have the alternative of sending the MMC4 away; some of the companies that refurbish B&O cartridges will also provide an examination report. After a report, you can decide to refurbish or not. Refurbishment can be to standard MMC4 or various upgrades of stylus and/or suspension. Both examination and refurbishment are chargeable, of course, but you need specialist tools to examine the stylus and also the suspension mechanism. Have a scan through these forums for “MMC4”.
That’s what I did – refurbishment of MMC4 to standard. Well worth the cost (and wait).