From: null@void.com   
      
   Hello everyone   
   Your various ideas caused a thought to "gel".   
   I will try this.   
   Get a smooth piece of plate a bit wider than the box-section.   
   Place your "ordinary" adjustable square on it, at the edge.   
   Make the blade/rule of the adjustable square protrude beneath the plate   
   lower surface by the amount you want to mark-off - eg. 25mm.   
   Bring "free" plate's edge to align with "side" surface of box you want   
   to mark, with the already-set adjustable square on it, and with hand   
   pressure keeping eveything touching where it should, slide along with   
   chalk under tip of adjustable-square blade.   
   Spin plate with adjustable square through 180deg and do same marking   
   down other side.   
   Those "heights" on the two "sides" will agree - probably the most   
   important thing.   
   Mark distances from the end of the box at which holes are and centre-pop   
   at the intersections.   
   Drill.   
   Done.   
      
   Hope this makes sense...   
      
   Will see whether this works - and report back, volente dio.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)