Are there any other more easily obtainable compatible heads other than the KL6? I got my L6 secondhand for a very good price quite awhile back, but somehow there were fingerprints and marks on the reflector and lens. I recently tried cleaning it again, but the reflector is still very streaky. I want to try and get another KL6, but they are so hard to find now. Are there any other compatible heads that are obtainable now? Advice on getting the streaks off will be nice too. I've tried slightly diluted isopropyl alcohol, and the lens seems to be very clean now, but the reflector is still messed up.