[Rhodes22-list] IMF is jamming

[Bud]

Rhodies,
  I was demonstrating the ease of my IMF when it started jamming up.
It looks as though my main is sagging on the inner mast and bunching up -
creating a thick layer of sail that binds inside the IMF.  I think I need to
"tighten" up the main at the top of the mast and make it taut again. 
Also, I have always had a lot of main down goose neck on the boom.
I think I also need to raise the main up higher.

Does anyone know what adjustments are available at the top of the mast?
How is the main attached at the top of the mast?
I assume I will need to slide the main out of the IMF to repair.

Thanks!
Bud