an easy hole for a temp probe is a drilled out valve stem (auto parts places usually have replacement metal stems to bling out your wheels).
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unscrew the valve from the center - and drill out the hole in the brass stem to the size you need. I have 2 different sizes on mine - one a bit larger to pass through the meat probe (which has a curve in it). Still the larger hole is not much more than 1/8" so no real air leakage.
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