Had an original throat fuse into the heat block and it got damaged/badly scratched by pliers in this removal. On fitting it back in the small screw is now unable to hold the extruder head and it drops the whole head whenever I attempt to print. I can’t find any hot end throats that match this unthreaded shaft type of throat with just the threading on the end. The threaded ones don’t fit. Does anyone have any links to buy a replacement either in the UK or ship to UK or any ideas or links on how I can modify my printer to accommodate these threaded hot end throats?