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  1. i_like_it_raw_ on

    Slot the heads with a dremel and use a flat head to remove them. If that doesn’t work, drill the heads til they pop and then use vise grips to loosen the bolt.

  2. PianistPopular6877 on

    Use a similarly sized tri square bit (spline, 12 point, whatever you want to call them), marginally too big, and tap it in so it cuts its own slots, the tapping action shocks the threads and helps loosen things too. Steel screws into aluminium can become very permanent sometimes though.

  3. Left hand drill bits for that, 5mm.

    Drill them, they might come out immediately, otherwise pop the head, and try to get the out with vice grips.

    If you can’t undo them with vice grips, then 4mm left handed bit, and likely retap the hole

  4. Centre punch and a hammer ,tap around the circumference of the bolt with center punch and hammer ,works every time .

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