I bought the LH switch from Ames and also had the same problem. I Put the "threaded nut" in a vice and used a rubber mallet to slide the shaft in further to where the origonal switch was positioned. After figuring that out I think I guess I could have installed it and shut the door. I can try give you a better explanation if needed. I was a little dissappointed at spending $6.50 on a switch you have to work on. If their was directions telling you that is was self adjusting it would be a different story.