First, it is crucial to consider the leaf blower you have. Once you have determined whether or not the problem lies with the unique properties of your leaf blower, there are several possible solutions to explore. One option is to try using a hacksaw or other cutting tool to modify the original gutter cleaning kit to fit more snugly onto your leaf blower. Another option would be to purchase an adapter for attaching different pieces of equipment onto leaf blowers, allowing you to use a new nozzle from another gutter cleaning kit with your current blowgun.  Finally, if none of these strategies seems feasible given your particular situation, you may need to invest in a new and more appropriate leaf blower.