Stuck starter solenoid?

I have both a contactor and a starter solenoid in my
kit built. The contactor is mainly to protect from
possibility of starter solenoid getting stuck. Its
not used for otherwise. My question is how frequently
do starter solenoids get stuck on? Anybody have that
happen to them? If it's really a remote chance, I could
remove the contactor and save some weight.

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Paul Lee, SQ2000 canard: http://www.abri.com/sq2000