I've had bad parts, parts missing, from all the vendors. CPP took care of a brake kit problem after 2 years of laying around in my shop. That just happened and they said nothing about 10 days and all that. If it's defective it's defective. Disputing the credit card sale creates an adversarial relationship. They are not in business to screw us. You will get the shipping refund and probably everything else if you maintain a reasonable attitude, I have found. They did, in fact, take care of your first problem ASAP. (defective part you could say)
