Honda XR600R - damaged camshaft replacement has not gone smoothly!

This XR600R, has been in before. Just a check over and all was fine. Months later the customer had concerns over a rattle. The camshaft was worn. I suggested getting an Original camshaft. The new camshaft went great except I overlooked a pin that should of been installed. The parts for this bike have took 2 months come from various suppliers and lost post. Once it's all finally started it has a misfire at any revs. I've got more issues with the parts that I ordered to fix this new problem which I'll cover when they arrive!