salon table

[sail4dale]

I have been reading various posting about the table mechanism and til now have been able to blissfully ignore the discussions.
Should've  listened!!  I have my table in a down position and it only will rise about 4-5 inches and comes to a hard stop.  Until that position is rotates freely but at the stop it is very stiff.  I have not lubed it either. 
I figure the brain-trust out there must have encountered this problem sometime so I am soliciting advice.
Does anyone have a detail diagram of the inside of this fiendish device? That would help me also.