By adopting a sedentary way of life, the Neolithic groups increased their awareness of territoriality. During the 9600-6900 BCE period in the Near East, there were also innovations in arrowheads, yet no important changes in the animals hunted was detected.
3. Poor screen preparation is a major cause of pinholes. Particles of dirt, wood frame chips, and dust remaining on the fabric during coating will be trapped in the emulsion. Opaque, they will block light from hardening the emulsion beneath them, so that the emulsion in these small areas will wash away after exposure.
I think you guys named just about every moving part connected to the rear...That really narroweded it down for him...lol. Normally look to the carrier or pinion bearing. Biggest cause of a failed pinion bearing is the NUT backs off the yoke. which in turn makes the pinion loose changing the preload which prematurely wears the pinion bearings. LOW fluid level will be the next biggest culprit of bearing failure. Good luck on the search for your HOWL. Jim :thumbup: