Posts like #109 are very helpful and need to be cited in future when we read of people just slapping in a replacement IMSB and flipping the car.
There are lots of draconian directives and pre failure directives published by some vendors.Now we have an example(perhaps) of why they are so insistent of specific conditions before they will warranty an IMSB replacement .
Pre-failure Directives
My car failed less than 1000 miles after an IMSB replacement by the P.O..
The freeze plug :
what if you distort the thin-wall IMS tube during insertion? Pin it & bearing+Loctite sufficient?
what if it becomes loose
Drill a small vent hole in it?
Which type of freeze plug and why? Many different types in the link I posted #108 .Cup style in s/s ,I presume?
Here is some Melling info on deep cups:
http://www.melling.com/Portals/0/Size%20Charts/Expansion%20Plug%20Dimensional%20Listing.pdf
Threaded Mode
