Little job is now a bigger job

[Chevy nutcase]

My temp sensor on my 66 c10 with a 250 never worked so I got one and decided to change it out today. Took the old one out and started threading the new one in and as I was tightening carefully towards the end it suddenly became loose. I thought the threads in the thermostat housing pulled out but it turns out the bottom of the boss is extremely thin and I split it. Now I've tightened a few things in my day but this just seemed very fragile to do that. Soooooooo a 2 minute job is now an event. I'm going to try to braze it because I have nothing to lose. If it doesn't seal I'll be posting in the WTB section for a lower thermostat housing