Don't have the bearings touching the belt - there should be a tiny gap (0.5-1.0mm). This will stop the belts from skipping on the pulley but will also allow them to move freely.
The best way I found to adjust them is use one of the Tamiya open-ended spanners on the hex part of the tensioner.
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Schumacher Cougar SV-Durango Dex410-Top Photon
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