The powerpole crimps live in radio corner. They will crimp 15, 30 and 45A connectors.
Crimping is a connection method that requires the plug insert to be deformed to grip the wire (to form a good connection). If the wire in the crimp is too small, the crimp will not be deformed sufficiently to grip the wire. In such cases, it is often possible to get a viable crimp by doubling up the wire inside the crimp. If this fails you either need a smaller crimp or you will have to solder the wire.
45 Amp Powerpole contacts have a slightly different design to the 30 and 15 Amp variety. The 45 A contacts have open “wings” to accommodate the wire correctly. To get a good crimp they need to be carefully aligned in the tool. If you are not very good at aligning things, an easy way to ensure a good crimp is to squeeze the wings together with very slightly with pliers once the wire is inserted and before crimping.