I made them all flush to start with which brought about the tracks to not be very long more than enough, And so the 3rd leaf overlapped the edge on the table by about one centimeter. Leaving that extra inch (of the block sticking earlier the tracks) will help you https://here99169.dm-blog.com/29676531/the-basic-principles-of-modern-extendable-dining-table-rectangle-sideboard-with-storage