I have a Ridgid R3100 11 amp reciprocating saw. It's been a great tool until today when the "tool free blade change" malfunctioned and I was unable to remove the blade from the saw. The blade change mechanisim consists of a small lever which when flipped up releases the blade. For some reason the lever is locked in the down position and the blade cannot be removed. Please inform me as to how I can fix this problem so I can continue using the tool. Thanks so much.