Get the housing clean and dry, and use high temperature epoxy cement to attach the magnet to a spot with plenty of clearance from any moving parts. I recall seeing a donut shaped magnet used in some automatic transmission pans, surrounding a dome shaped projection in the bottom of the pan.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!