I used the Gomexus "Plug & Play" Power Handle For Okuma's Inspira/Helios/Epixor Xt Spinning Reels!
This isn't just the knob alone but rather the whole arm assemblage. Just unwind the original of & wind this one on. Simple. This is #X003L9LACZ Gomexus Spinning Power Handle 57/63/65/75mm. I've recently started a working relationship with Gomexus so will keep trying to figure out ways of adapting current inventory to match your needs.