lee i know EXACTLY how it works,,,,,, i also have very very good working knowledge of em and know that for the hassle hes getting removing the dust cap will cause NO problems,,,,,,, ive NEVER ran any on ANY of my cars, or any mountian bikes and also ive been working on bicycles since i was 12 and never had a issue with dust causing the vavle to stay open either

usually the spring causes issues ive seen thats on the other side