There is a few options you can try. You could replace it with a plug if you can find one that fits properly. You could cut the end of the plunger off but then your engine may backfire when you shut it off (I've done this to the ones on Briggs engines). Your last option I can think of is hooking it up as it was from factory. If I remember right it runs off of 12v switched power. Turn the key on and the plunger drops, shut the key off and it raises but it must be grounded to test the operation.