HI,

Today I found myself assembling a small child's bike as a favour for a family member.Everything went together OK (I even managed to get the forks facing the right way around - go me!) but I'm having some issues getting the caliper arms centred. As you can see from the photo below, these are side pull calipers, and unlike good quality ones, they have no flats on the spring pivot. Because of this, there's no way to keep the spring assembly centred as I tighten the bolt behind the fork. The spring just bends and throws the whole thing out of centre when I let go.I'm aware there's a tool available for keeping the springs centred, but has anybody got any ideas on how it can be done without resorting to specialist tools? Or am I doing it wrong somehow?

Please help.

I didn't find the right solution from the Internet.

References:
https://forum.cyclinguk.org/viewtopic.php?t=28714
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Thanks!