I used this one to crimp up to 70mm lugs:
With that tool, crimping was the easy part. Getting all the strands neatly into the lug was more tricky. I found that if you bind all the strands together by wrapping them in plastic you can get them into the lug. (A tiny rectangle cut from a piece of blister packaging works well.) Once in the lug you can carefully wiggle out the plastic - just make sure no part tears off inside the lug otherwise you will have a poor connection.