Peg Board Filament Rack Bracket

This is a peg board bracket for my filament storage system. The bracket uses 1 1/2 inch diameter PVC pipe for the axle that the filament spools ride on. The lengths for the PVC pipe are as follows:
1 filament spool - 5 inch length of pipe
2 filament spools - 8 inch length of pipe
3 filament spools - 10 inch length of pipe
4 filament spools - 13 inch length of pipe.
I tried a six spool storage section and had catastrophic failure of the bracket so I do not recommend storage racks of greater