I have a 20-25 euro tool for crimping quick disconnects (
link), those in red-blue-yellow color. With cheap crimps it never did a great job. Recently I'm trying to crimp better crimps, such as Farnell 2293338 (TE 2-520184-4) and I'm having an even worse time. The wire can be pulled out easily. The blue crimps I have to use on the red tongs, otherwise they don't work.
Is this because more expensive crimps are a lot tougher, and require a stronger crimping tool?
I've tried adjusting the tool to the highest force. It requires both hands to engage, and doesn't help.
edit: or am I simply using the wrong type of crimp tool?