Iceweed. There is one currently for sale on the French website Naturabuy, see hereafter https://www.naturabuy.fr/DOUBLE-DETENTE-MANNLICHER-SHOENAUER-item-2467480.html . Was your M. 1908 initially set with a double trigger; if not you will have to do some work in order to have the double trigger/trigger guard fitting in a space originally planned for a single-trigger type mechanism. Louis