@a91what
The clearance problem for the bolt heads is to use some Cad Plated MS24694-S178 -516R46 flat head structural screws 2-29/32" long 5/16-24 thread cost is $0.93 each These use a 100 ° countersink. You can cut these long screws to whatever length you want.
See http://www.aircraftspruce.com/catalog/hapages/ms24694.php
http://www.aircraftspruce.com/ 1-877-477-7823
See https://www.amazon.com/Countersinks...h=n:256259011,p_cutting_angle-bin:100 Degrees for the 5/8" diameter countersink cutter bit you will need to finish the job.
The clearance problem for the bolt heads is to use some Cad Plated MS24694-S178 -516R46 flat head structural screws 2-29/32" long 5/16-24 thread cost is $0.93 each These use a 100 ° countersink. You can cut these long screws to whatever length you want.
See http://www.aircraftspruce.com/catalog/hapages/ms24694.php
http://www.aircraftspruce.com/ 1-877-477-7823
See https://www.amazon.com/Countersinks...h=n:256259011,p_cutting_angle-bin:100 Degrees for the 5/8" diameter countersink cutter bit you will need to finish the job.
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