This is all I could find. Any experience with this?

http://www.vexilar.com/pages/accessories/accy_pro-mount.html

Does anyone know of another?

I had my 480 mounted on a Johnny Ray swivel mount

I'm not familiar with that. Is it a quick release and where do you get it?

Basspro has them. Do a search on their site for Johnny Ray.

http://www.basspro.com/webapp/wcs/stores/servlet/Shop_10151_-1_10001

Have had this one for my 320 for over a year---no problems. Take it off every time and still is tight.

http://www.basspro.com/webapp/wcs/stores...t=SearchResults

go to bps and get a johnny ray 300 mount bee using them for 14 yrs without a failure

Thanks to everyone. I'll check it out at BPS.

Vern, I sent you a PM about a swivel mount I'll give you.

Got it. Thanks. Saved me a trip to BPS. I owe you again. Now I'm off to beautiful Lake Tyler for 2 days of fishing.