Sam, I reckon you might be alright without the tether. I think that rule is more aimed at grade 3 arenas or less (i.e. with a net/fabric roof). The Robo Challenge arena can stand all sorts of punishment (Bitzawood's disc shattering with an almighty bang last year was proof of that) so it should be more than capable of coping with a stray axe head. Heck, your tether would probably give way before the welds on the axe do!
Best bet if you're struggling would be to give James or Grant a ring (their numbers are in the event info pack) and just double-check with them where they stand on it.
Best bet if you're struggling would be to give James or Grant a ring (their numbers are in the event info pack) and just double-check with them where they stand on it.
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