When you purchase a pair of Supernova fins you receive a MFS Multitool that includes 4 spare MFS Lock Plates (clips).I have never seen let alone used Supernova fins. I was told by my LDS (a big SP dealer) that to change blades or foot pockets, there is a clip which must be removed and then reattached when making these changes. Hence, if one loses/breaks a clip(s), the fin(s) are useless.
Also according to the LDS, SP does not sell replacement clips. For those who have/sell Supernovas, is this accurate?
Your LDS is correct in that the MFS Lock Plates are not sold individually. Scubapro sells the MFS Multitool that includes the 4 MFS Lock Plates for $10. I would bet any large SP dealer to have a few multitools in service spares so they can give away a single MFS Lock Plate for their good customers that are in need of one.