Can you crimp a tubular lug without a crimper plier?
Now that I know the wire in question is in a main distribution panel from the meter to the main lugs, any crimp must be done with the proper tool and dies. This will require maybe a ton of pressure and absolutely no shortcuts would be advised.  Also note that this type of work usually requires the sign off and supervision of a Master Electrician.  Check with your local electrical utility for inspection and sign off requirements.  Please be careful, this is potentially  extremely dangerous and a great risk of fire if not done properly.