Need tool or trick for washer elec pump install

1967 Dart with elec washer pump.

I have searched old threads and cannot seem to find my answer and need some help.

Existing jar was broken, and my wife bought be a new washer jar for Christmas (atta girl!)

With the existing jar broken, it was easy to get inside and undo the nut/filter combo and get the motor freed from the broken jar.

But I am having trouble figuring out the best way to properly install the existing motor to the new jar. Is there a special tool or trick to get down inside the jar to turn the nut/filter with enough power to obtain a proper seal?

Thank you for any help.