Wasp Trailing Log Spinner

I have always liked the principle of trailed logs - a devise for measuring distance travelled through water. Trailed logs were a fixture on every cruising yacht in earlier days until the advent of electronic navigation instruments. One of the advantages of these "antiquated" instruments is the lack of power requirements - what, no batteries. There is one problem with

trailing logs - apparently they attract sharks, most logs come with a spare spinner but that's only allows two shark attacks. I thought that there might be a need for spare spinners. I have been producing spares for Wasp type logs. Check out ebay .......... I'm looking for a "Walker Log" to replicate. The Wasp blades are cast with copper filled epoxy with a brass and stainless body.