Don't know is this the correct description but here a picture. One bolt is missing, and forgot to investigate further after taking the picture in November. Now on crutches and its was -23 C in the morning so trying to get the info an easier way than going out
Assume that there is no access for a nut so should there be a threaded plate laminated to the hull ? It looks like the bolt would goes through the tube(can't be?), or then its very short.
Hope someone here knows the details, thanks.