Found it: For quick removal of barrel pin (an replacement at reassembly) there is a homemade tool with parts from any hardware store that cost a few cents and require almost no assembly, search on this forum for post#45 on March 11., 2021 by Joe From NY under “tools for cleaning and maintenance of the R9”. There is also information on modifying a Bus Puller from Lowes or Home Depot to make replacement of the guide rod and spring into the slide on reassembly. These two simple tools make cleaning and inspecting the R9 a breeze! Cargaritaville has also made such a post under a similar heading I believe.