The answer to that question is: synthetic resin glue and that is a test question on the writtens in my time, I don't have any hands on on the heavies either, I graduated in early '91 and there were no jobs at that time, worse than now.
Just out of curiosity is that cap info in the old Airframe handbook I haven't seen that thing in years but it is good information, I came here because of a post some pilot of rotary wings had on a Bell Jet ranger and stated that the compressor stages and the turbine were only connected by gas stream haha, I couldn't resist the temptation to get into basic gas turbine design. Pilots
