I have disassembled and cleaned (as far as possible) my 5 inch three jaw and four jaw independent chucks and I'm wondering about lubrication. The four jaw has captive screws in carriers which have been pressed into the chuck body and cannot be completely disassembled. I've had mixed messages. Some say to use machine oil. Others insist that the scroll must be greased. Still others advise using a dry graphite spray lubricant. A machinist friend insists that chain lube is best. Any advice would be greatly appreciated.