The stability cost of Japanese pagoda masts

How heavily built were Japanese pagoda masts, and what effect did they have on stability?

They caused significant stability problems and were not as heavily built as their size and exposed duties might suggest.

Japanese pagoda masts troubled ship stability because their equipment and structure put considerable weight high above the waterline. Their complicated appearance did not mean every part was built as heavily as might be expected. The structures were probably less robust than the demands imposed on them required. Adding observation and control functions above deck could therefore impose a serious naval-architecture penalty on an older battleship hull.