Now I mount the tie down bracket and the spacers to the wing spar, check several times to make sure that the orientation is correct and back drill the bracket using the holes in the spar with a #12 bit. Nothing too tricky here, just make sure you drill straight . Disassemble all the parts, mark them and the orientation, deburr everything, countersink the spacers on the side that will face the spar, clean and prepare for priming. I also used the tape trick to hold the spacers in place for drilling.