Hey Brian, we're so sorry you've been disappointed by your experience with the RHT300 Swivel Head Rivet Tool. Sometimes when a mandrel is stuck inside of this tool, it can be removed by pulling the rivet tool handle all the way open, holding the tool horizontally with the nose pointed toward the ceiling, and inserting a new rivet until the stuck mandrel falls out the back. However, we understand there may also be other issues at play here, so if this does not resolve the issue and you have not yet returned the tool, please give us a call at 800-776-2228 or email customercare@arrowfastener.com. We do stand behind this tool with a limited lifetime warranty, and we're here to help! -Your Arrow Fastener team