Hello
with the funnel you should be able to put it; Alomejor you have the wrong funnel and you need another bigger one, if it were adequate (the one who covers your head), check it a lot of oil to slip well, or fat, if you still could not put it there is a tool that is pneumatic that opens the
overal Inside a steel frenulum, once it is removed with a nylon hammer and some taps it must come out, put the new overalls, with some taps you put the head of the stick making sure that the frenulum is well taken, it is full of fat and hold it with the clamps that normally come to you in the dusty kit.
Greetings