In the first instance, 'Please' telephone!
It's far quicker & easier for us to answer general questions or in-depth technical matters over the telephone, when e-mailing us a question either about installing our regulator or tuning in your airgun, please help supply us with as much detail as possible in just the one e-mail. We strongly advise the following:
Make & Model of Airgun,
Caliber & Power of Airgun,
Regulator Model & Pressure Setting.