This morning when I tried to put the key in the ignition it wouldn’t go more than halfway. I had a lubricant that doesn’t allow dust to stick and sprayed it on the key and then it worked fine. I’m assuming that dust can and will accumulate in the tumblers of the ignition due to its vertical placement allowing dust to settle into it. The lubricant I used is a 50/50 mix of diesel fuel and transmission fluid. This can be mixed in a handheld spray bottle or you can purchase a rechargeable aerosol can at most hardware stores.