NV65AD3 or that kind of ?

NV90AB2

on the biggest transparant plastic part that will fitt on the upper part and the squill will fitting in. with a well-fitting pipe wrench that fits just in the rounding so you can control it somewhat fix the upper part in a bench vise then push with the pipe wrench around 20 mm or maybe some bigger it to its place and with both hands you can push it on place, a plastic hammer is not allways necessary .