Adhesion point on the tail boom must be absolutely clean (no bits and chunks left over from the last one).
Put fuselage in trailer with replacement assembly in tailwheel recess. Mark fore and aft point on tailboom. Measure it twice.
Rubber cement. Follow instructions.
Get it straight. Fuselage upside down so that you can sight up the fuselage
Let it set at least overnight.
Tape edges of replacement assembly with a nice cloth tape.
Get an experienced glider repairman to do the above if at all possible (that's what I did)
Note that glider doesn't roll perfectly straight...
Make sure next glider has pneumatic tailwheel...
Fred