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Assuming your using PVC, I would come out of the ground and install some expansion couplings, which will take up a good portion of your 3' stone wall. Expansion couplings are used to prevent damaging the conduit or gear mountings from earth settlement and frost heaves. PVC fittings can break easily at cold temperatures.

Use a short section of deep unistrut to anchor the PVC pipe to the stone above the expansion coupling. Then once you pass over your stone ledger, offset back to the wall and install your gear as normal.

Preprep your unistrut spacers and paint them before installation, with some high quality paint to blend in with your stone, so that they don't drool rust in their later years.


 
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