It was tough to get the bolt through several layers of washer shell gasket rack without a little wiggle room.
Install solar panel on roof rack.
Both cone connector sizes are available at big box hardware stores.
Also be sure the stanchion flashing fits beneath the roof shingles to prevent leaks.
Fed up with your utility power company.
Have a helper press a piece of wood up from the inside of the shell to brace it against the pressure of the drill.
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Mark the position of these holes on the solar array and then drill a hole through the board not the solar panels that is going to be big enough to run a bolt down through.
200w of solar panels on the roof rack.
Installing the solar panels is done by using unistrut cone connectors 1 4 inch or 3 8 inch to attach to the slotted steel l brackets.
So are thousands of other diyers.
On the roof lay out the locations of the stanchions that will support the solar panels.