I had bought two Tru-Nords already so I gave the Marbles replacement to my father. So far so good. I think that the oil is some sort of mineral oil. I took the old broken one and drilled a 1/16" hole in the casing to see if it would work as a dry compass. It didn't. <img src="/images/graemlins/grin.gif" alt="" />
WARNING & DISCLAIMER:
SELECT AND USE OUTDOORS AND SURVIVAL EQUIPMENT, SUPPLIES AND TECHNIQUES AT YOUR OWN RISK. Information posted
on this forum is not reviewed for accuracy and may not be reliable, use at your own risk. Please
review the full WARNING & DISCLAIMER about information on this
site.