Overdrive Separation question

["Nolan Penney" <npenney@mde.state.md.us>]

I need to remove the J type overdrive from the rear of my single rail gearbox.  
Do things fall out of the overdrive when I unbolt it, or does it just neatly 
pull 
off once I've removed the bolts holding it to the back of the main gearbox?

I really don't feel like having Laycock overdrive pieces come falling out...
The Bentley manual leaves this question completely unanswered and unclear.

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