Best way I have found is to use a rare earth magnet imbedded in the table edge and a steel receptacle screwed on the wall where there is a metal brace going vertically, about the centre of the table but not quite.  I have these rare earth magnet sets on my website if you cannot find them locally.  

<http://www.frankcondelli.com/staging1/store/index.php?route=product/product&path=61_109&product_id=1076 <http://www.frankcondelli.com/staging1/store/index.php?route=product/product&path=61_109&product_id=1076>>

 
> On Nov 24, 2014, at 7:12 PM, Automatic digest processor <LISTSERV@GERRY.VANAGON.COM> wrote:
> 
> Any suggestions on how to better secure/lock the table.   The two screw
> knobs - one under the table, and the one securing the pole-don't seem to be
> doing the job to lock the table in place, without really tightening them,
> and then still they are slightly loose.

Cheers,    

Frank Condelli
Almonte, Ontario, Canada
'87 VW Westy, '00 Kawasaki 250 Sherpa, "98 Ducati 750 Monster & Lionel Trains (Collection for sale <http://frankcondelli.com/trainsal.htm>)
Frank Condelli & Associates <http://www.frankcondelli.com/> - Vanagon/Vanagon Westfalia Service in the Ottawa Valley
BusFusion <http://www.busfusion.com/> a VW Camper camping event, Almonte, ON, June 04 ~07, 2015