I'm having trouble getting my Spyder Pilot ACS to work properly. I've had it for 6 years or so and only shot around 100 balls through it. I got it out to play the other day and the solenoid wont push the hammer hard enough to release the bolt. I've tried a new regular 9v battery and it still wont push it hard enough. Do I have to have 9.6v battery for it to work? Any help?