The positive aspect of our field trials is finding out what works, what doesn't and all those variables in between. We all pick our favourite system(s) and rely on their known qualities. It behooves everyone to try everything. We have discussed the scenario of being totally without tools and fabricating them from the environment. It would be very embarressing to dismiss ie magnesium bars only to find ourselves someday with only that very resource and never having practised with one. <img src="images/graemlins/blush.gif" alt="" />