Does anyone know how to make a pressure valve and exhaust valve for and McComrick Deering Farmall B. This is an add on to the tractor for lifting the implements. It is referred to as Pneumatic " Lift-All ir Exhaust " Lift-all". I have not been able tofind a used or new one. Any help will be arrpeciated.

Thanks and I am new to your form. I have a manual for the Mower for and will share with you.