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For those awkward ones where the joists are too close together to get the drill into the compartment between the joists, can you find a drill bit long enough that you can pass it though the hole and thus have the drill in one compartment while drilling the joist of a different compartment?
Example, you have 3 joists, spaced so you have say 200 and 400 mm compartments, you use your drill with 100mm stubby spade bit to drill the middle joist with the drill in the 400mm pocket, then swap the stubby bit out for a 300mm long bit and drill the joist on the other side of the 200mm pocket with the drill still in the 400mm pocket and the drill bit passed through the middle joist?
You may also be able to drill a larger hole at a slight angle (having the drill under the adjacent joist) with a long bit (so the angle is as shallow as possible) to clear enough material to get a straight run through for your pipe etc
Maybe buy two, as they're only a tenner, then you don't have to trek back to TS if it breaks on hole 3, and you have a new unopened one to return next time you're there if it goes the distance ..
Example, you have 3 joists, spaced so you have say 200 and 400 mm compartments, you use your drill with 100mm stubby spade bit to drill the middle joist with the drill in the 400mm pocket, then swap the stubby bit out for a 300mm long bit and drill the joist on the other side of the 200mm pocket with the drill still in the 400mm pocket and the drill bit passed through the middle joist?
You may also be able to drill a larger hole at a slight angle (having the drill under the adjacent joist) with a long bit (so the angle is as shallow as possible) to clear enough material to get a straight run through for your pipe etc
Treated gently it'll probably be fine. If an augur but doesn't work try a spade and press lightlyLess than a tenner, and yes I know it's a POS
Maybe buy two, as they're only a tenner, then you don't have to trek back to TS if it breaks on hole 3, and you have a new unopened one to return next time you're there if it goes the distance ..
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