ok i bought a used 16 x 32 4 buttress w/straps is has a 52" wall . previous owner knew nothing about it as he just bought home. I am not an idiot as such i am trying to learn as much as possible before i assemble this. I think some parts may be missing. i have been watching and reading assembly videos and have a good idea of what should be there. i am going to assemble in the yard before i dig my "final spot", when i find that im missing pieces where can i go to figure out what i have so i can get replacements? i can take hi res pics and post if anyone can help. thanks in advance.