Arkon Removable Swivel Air Vent GPS Car Mount Holder for Garmin nuvi 40 50 200 2013 24x5 25x5 GPS

Had mine for two months and the knob that holds the spring clip to the plate has broken. Know where I can get some replacements?

I hope I'm not asking a stupid question. Where are the clips that the GPS snaps into to hold it in place???

does the mount ball fit into a garmin nuvi 50 with 5.00" inch screen

Will this mount work with the bracket on the back of a Magellan gps. I think the ball should be the same.