kunifer cupro-nickel fuel lines

[ade61]

just installing a 10mm o/d kunifer fuel line (flow to injected engine, so about 4 bar max) and not having much luck with flaring it (the flaring tool seems to hold the pipe well, so well that it crushes it quite a bit), but the resulting flare doesn't seem large enough. On the same line, i have some Swagelock stainless steel twin olive compression-type connectors, but i am not sure these will stay tight/leak-free (as the kunifer is comparatively soft, will the fitting loosen over time?).
So, any tips on flaring....and anyone successfully using compression fittings on kunifer?

[ade61]

its probably a cheap one, where the pipe is clamped by squeezing the legs of the tool together (bit like a crimping tool), then swing the coned pointy bit over etc

[ade61]

thanks v8 very helpful