I've been looking over these Nagaoka cartridges. I like the look of a MP11 boron. It's not made anymore . However, the NP20 stylus with boron cantilever fits the MP10 & MP11 cartridge bodies . Is there any structural difference in the cartridge bodies MP10, MP11 & MP20 . (The MP30 and MP50 use aluminium bodies and have a "fixing" screw for the stylus).
Excuse my ignorance, but when this carts are discribed as moving permalloy does mean the same as grados moving iron principle ?
thanks