Yeah, Bending springs are meant to be used with un-heated PVC. If it's a cold day when you're working with it outside, giving the conduit a rub with the palm of your hand can often produce enough warmth to make the bend easier. I have springs for 16,20,25 and 32mm dia conduit. Bending the conduit "under" your knee-cap is a pretty common technique here in New Zealand.
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