Abstract: A borehole reaming cutter retention and fastening/locking system enable field replacement of borehole reaming cutter assemblies utilized in infrastructure emplacement horizontal drilling (HDD) applications. The borehole reaming cutter assembly retention/fastening system can withstand borehole drilling forces without the necessity of permanent welding, thereby allowing cutter interchangeability/replacement in the field. The borehole cutter retention assembly shape and design, coupled with the fastening/locking mechanism design, may be robust enough to replace permanent welding and may allow field cutter interchangeability and replacement. Current designs and devices utilize permanent welding of component/cutter assemblies, thereby requiring workshop/welding construction and deconstruction to enable the interchangeability and replacement of cutter assemblies.