I have a nice brand new set of 90 degree turned valve stems that I have had over a year. I don't want to go to the stealership and let them scratch old blue and I bet they would. Anyone have any tricks that I can deflate and easisly remove stock and replace with my new 90's and I have an aircompressor. I would hate to think I need to fully remove the tire from rim and would hope not. Thoughts peeps?