I just tighten & loosen by handWhatever you get, it's worth investing in these quick changers, I can't remember last time I used the spanner thing.
https://www.ebay.co.uk/itm/Milwauke...712669&hash=item35f715dbf5:g:JXoAAOSwPc9Wyv0d
I do on the 4.5" but no way you can on the 9" the majority of the time if you work them hard. I use the Bosch SDS system on mine, spins off no probs after the initial click.I just tighten & loosen by hand