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Another Dreamline Question

Does anyone know the length of the valve pin spring (position 9 on the schematic- part # 19850) I have been trying to correct a leak , I have replaced the valve seat and o ring but I still have very slooow leak. When watching 910 Airgun valve assembly video I noticed that my valve spring is longer than the one shown. In fact my spring extends beyond the end of the valve pin when I try to install the valve holder ( position 8 part # 20037) is this normal? could it be cause of the slow leak? The rifle is still under warranty. Any thoughts or suggestions would be appreciated.

Bill