I need to add a new refrigeration circuit to an existing rack. The suction and liquid manifolds are made of 10 cm and 7 cm OD copper pipe. I feel confident at doing all the isolation, shutting off and recovery job prior to the actual openning of the manifolds. What Iīm not too secure about is on how to perform the actual punching of the copper pipes, without having too much debris entering the system. Any word of advice?