What is the best tool to crimp cable end caps - especially those where access is limited, such as dropper post remotes?
I have got a crimp area on my cable cutters, but it is a bit fiddly to use, is there anything better?
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There are stub-nosed dedicated crimping "pliers" where the crimping is done at the tip end, which is typically what works best for limited access situations, as opposed to back by the hinge where they're sometimes added on to other kinds of pliers or cutters.
Another approach that still works well for limited access spots is keeping around a pair of dull, bad quality side or diagonal cutters, and just using the tip. Don't use good ones because it will be too easy to cut the endcap by accident, but there are a lot in the world that aren't good ones.
Some wire strippers also have crimp areas near enough to the tip that might work.
Another tool common in bike shops that can be capable of reaching in and putting a good crimp in tight spaces is a lockring plier, such as this Hozan:
If you want a bit of a lo-fi solution, I crimp all my cable ends with a mole wrench.
Set the mole wrench so the jaws just about close when locked together.
Hold the ferrule in the tip of the mole wrench lengthways and place onto the end of the cable. Squeeze until the wrench locks closed. The ferrule should get properly crushed onto the end of the cable.
It takes a little bit of force, but you get a really good crimp.
If you have a crimp tool for electronics you can use it for end-caps/ferrules of bike cables as well. Use it on one setting larger/wider/looser than you would for an equally sized electrical cable to account for the fact that steel bike cables do not compress as much or easily as copper cable strands.
I have personally done this quite a few times this way.