perhaps slightly heat the wax and pour it in
that toilet wax ring melts easily with tiny amount of heat.
Only thing is I would not want much heat on the transducer.
about 100 degrees and that stuff gets soft like soft butter.
I am using the transom mount transducer, so it has a bracket and with that attached, I can pull the transducer up and down.
A cartridge tube of lithium moly grease is only a few dollars at wally world.
You dont need marine
grease, just grease with a lithium base. Lithium base greases dont mix with water and wash off.
Regular grease will mix with water