So, I've got a Folgertech v3 and the thermistor is held in the hot end by a tiny (1.5mm) set screw. The thermistor has a little brass collar around it so when you insert it into its hole in the block, you can tighten the set screw to hold it in place. I can't find replacement thermistors with this little collar and I'm concerned that if I put the normal thermistor into the hole in the block and tighten the set screw it will break. How do others hold the thermistor in the block?? Thanks