My photos show how I remove the original and then simply replace the interior with the new interior of this 10 pack. All you have to do is take the glue tip and clean the inside of the original tip and then insert the new one. All these negative comments here that they don't work because people desolder the old one and solder the new one in without properly calibrating it. The good news is that 95% of the time the problem is not with the green block but with the internal sensor. I hope I can save people time and frustration with my review.