Temperature on hot end module

Hello,

I had a print get clogged and not finish. I tried to unload and load the filament and it was grinding on the feed gear. Then i noticed it was only getting to the set temperature and not maintaining the temperature. It would instantly start dropping. So luckily I have a replacement hot end but when i went to swap it I noticed the temperature sensor was just barely touching/not really inside the hot end at all. Is there a certain procedure/material i need to re insert it and have it stay at the right depth? It looks like it can go pretty deep into the hot end.

Please let me know if any of this makes sense and if anyone knows how to help me.

Thank you!