Temperature Probe HOUSING

["Daryl May" <mayfam@sprynet.com>]

Need guidance, please, on the HOUSING on my 1275 cylinder head that holds
the temperature sensor.

Stripping the head for a rebuild, I foolishly tried to unscrew the housing,
which snapped off.

1.  Is it a force-fit, or a threaded part, or what?

2.  If a force-fit, I'll need to drill out the neck trapped in the head. 
Then do I just hammer the new one in?

3.  If a force-fit, what would you suggest to stop the replacement part
from leaking?

Thanks,

Daryl