After a series of postings about misplaces pip-pins, I ordered 4 spare Carr Lane Double-Acting Ball Lock Pins (part no. CLMF CL-4-BPDR-1.15) from RMP Industrial Supply, Fort Worth, TX. I'll order 4 replacements for the tail pip pins next. I want to be sure I carry at least one spare pip pin of each size along with other spare screw, nuts, etc. in the aircraft.