GV 4 question

hhi all i have a gc 4 i just purchased a month ago . its a use table abt 10 yrs old . ive heard in this forum that there is a frame defect on this particular model . causing slate sagging on the head and food area . i read abt it and understand that it because of the head and foot frame not being fully secured to the body frame . now my table is 100 % leveled right now thanks to fernando from orlando fl billiards . how often does this sagging occur ? is it common and has anyone here ever experienced this on their gc 4 . thanks .

gc 4 frame pic

here is my gc frame pic . the foot and head frame looks ok to me for now :sorry:

Thank you rkc , ill keep a close eye one these defect areas . Kinda sucks , why does it have to be on a gc 4 and not the other models ! Haha j/ k

Can the angle iron be installed while slates are on ? I really dont want to strip the table , i just had it fine tuned yesterday . And yes the mechanic used the foot end adjustable shims , so im checking the joint frequently for any sagging i that area

this is the area where the adjustable shims were used .