As has been pointed out above, if you're replacing one that's had it's rubber tip torn, it's most likely due to the main fuel screw (Smoke-screw, Star-wheel, fuel-pin won't do it) being turned up (we all do it). The problem with that is that with using stock injectors, there's residual pressure in the head/rotor that in the right conditions, can bleed back and damage the new part the same way when coming off a wide-open throttle.
One can modify the FSS plunger so it's less susceptible to damage, but it's a 50/50 thing pending how YOUR engine is set up.
The best fix for damaging FSS solenoids in an injection pump that's had its main fuel screw turned up is to add larger injectors. Doing so reduces the peak pressures in the H/R such that the FSS is less likely to be damaged again.
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