^^^ This.Or use the fel to raise whole tractor after releasing pins and front mount pull mower forward to sep drive shaft and get deck out.
I have a BX as well and whenever I have to take the MMM off I am generally attaching the FEL, or vice versa. So, it's convenient just to use the FEL to raise the front of the tractor up about 6", which makes getting the MMM out sooooo much easier.
The FEL, along with the PTO-selector-in-rear-mode, make getting both the MMM and PTO jackshaft attached/detached pretty straightforward. The longest part of the job is turning the anti-scalp wheels 90 degrees.
Wrooster