Re-tipping make no sense, because a brand new cartridge cost less than re-tip alone.
At higher price better vintage MC cartridges available with better styli and better cantilevers, as a result much better sound. Investment in Denon make no sense for this reason, refurbishing make no sense too. Some people just love to mess around with them, in the end the overall price is way over some other nice MC cartridges that does not require any mods at all.

