Mast base pin

A pin that is part of a base-plate with swivel. The lower mast section sits on top of the base-pin.
More pictures will follow to illustrate the construction.
!!!! CAUTION !!!!!
!!!! This part is not stress tested yet
!!!! Allways be carefull when using untested parts
!!!! CAUTION !!!!!

When we have done further tests this warning maybe removed, but setting up masts should always be carried out with extreme caution.