Why not install a quick-disconnect switch? That should give you an extra inch or so.
I have one on every car I own. It will allow you to stop an electrical fire quite rapidly, and costs only around $12.00
Semibodacious Transmogrifications a Specialty
1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)
"Time flies like and arrow, yet fruit flies like a banana"