Thank you everyone for your responses, I had no idea it would spark so much debate!
To be honest I was pretty much resigned to buying a new crank, but thought it was worth an ask before buying.
An alloy cap has been purchased and installed. I loosened the pinch bolts for installation and could immediately feel the lateral play on the NDS arm, however as soon as I screwed the cap in place the arm would no longer wobble. With the pinch bolts retightened to the instructed 12nm it feels completely stable.
I'm off out on a 30km loop on Saturday, so if the problem remains it will become evident.
Thanks again.
Best of luck mate.
Funnily enough, exactly the same answer if you fit a new crank
If a shop charged you to fit a new crankset and it came loose, you would expect it to be repaired under warranty. No mechanic with any sense would offer any guarantee that a bodged repair to a damaged crankarm would last 5 minutes. Very different answer.
Im going to leave it, my excuse is been a girl.
Tracey, you're one of the few folk I'd happily let work on my bike! 🙂
Folk have been getting very het up in here and I don't think there's been any real disagreement. Just some folk saying "you're not supposed to expect it to do X" and others saying "yes, but it can do X" 🙂
Here’s something to try. Do your little plastic cap up finger-tight to preload the bearing, fit NDS crank, torque to recommended setting, and then try and undo that finger-tight cap.
Then tell me it’s not taking any load
It's being pinched by the pinch bolts, which are squeezing the tube of the axle. I always, without fail, try and undo the torque cap before releasing the pinch bolts, 'cause I'm a numpty.
I'm going to leave it
I don;t think there's any shame in removing oneself from a thread when it's getting a bit repetitive 😉
And good luck OP, if you keep everything nipped up it'll hold on for quite a while.
🙂
