I'm in the middle of upgrading the cartridge on my Rega P3-24 from the Elys to the Exact. My question is this -- I have a collection of 45's but rarely play them on this turntable. i had heard somewhere, maybe here, that playing the older 45's from the 60's and 70's can damage a cartridge or stylus and that the modern cartridges should avoid those older polystyrene 45's no matter how good a condition they appear to be in. Any truth to this? I'd like to enjoy the 45's that I've had sitting patiently as well as some newer Record Store Day and other new 7" records.