Could you get an auger and attach it to a universal joint of some kind?
Even one of these which is designed for wood drilling might do if a 25mm hole would suffice? https://www.screwfix.com/p/bosch-spur-auger-drill-bit-with-hex-shank-25mm-x-160mm/517fw
@rhowe started
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Could you get an auger and attach it to a universal joint of some kind?
Even one of these which is designed for wood drilling might do if a 25mm hole would suffice? https://www.screwfix.com/p/bosch-spur-auger-drill-bit-with-hex-shank-25mm-x-160mm/517fw