Perentie sent me a fair-dinkum commercial action wrench, so I thought I'd show my home made one which looks decidedly amateur compared to his.
It's made from an M18 8.8 bolt, rough ground then filed down to slip into the action's locking lug areas, like the commercial ones.
I chose M18 because it's an almost wobble-less fit in the Rems, so there's optimum diameter and no twist. We're only talking up to 100 ft/lbs anyway.
I used the head as the locking lug section, being careful not to overheat the steel, then I'd have to reharden it or it might deform.
I also purchased an extra thick nut which screws down over the threaded section all the way. Then the excess thread was cut off and the nut welded on the end, so it wouldn't come undone.
The size I bought is still on the tag on the bag from Bolt and Nut Factory Online, these guys sell everything fastener and are in Brisbane I believe, Hemmant, and post all the strange bolts I need to me in a matter of days. You won't find bolts like this at Bunnings.
In theory, you could make an action wrench for any rifle action out there.


