ORIGINAL: Antique
Look up 2 threads to see 2 ways to do a hub...First is one with no linkage and no electronic advance, the sensor wire comes out the bottom of the ring..Second is mechanical advamce..In both cases the magnet is mounted flat under the hub and can NOT come out...Only disadvantage to tjhis method is if the sensor goes bad the hub has to come off to replace it..Sensors rarely go bad...
Antique,
Curious, what would happen if one were to install a short length of shrink sleeve tubing around the section of prop hub that holds the magnet? Have you seen that set-up before? Thinking about doing that to my engines....I haven't lost any magnets in hundred's of flights so maybe I'm flying on borrowed time.