The PI one needs a 10mm hole which seems like a big hole. The vespe (note vespE not vespA spit spit spit) do 7.5 and 6mm I think, the map are 7mm hole.
By far the nicest to use are the wheeled systems like maver (I have used) and drennan (not used but it is the same principal), the preston is wheeled but again I have not used it.
The map ones work I have done 8 top kits with them recently, very simple. The vespe has good comments on another forum.
Only put one in a reinforced area (sorry if I am being condescending, that means I talk down to people, but I thought it might be worth mentioning), assuming you are going for one that requires a round hole, don't know how you would do a slot :
Put a wrap of masking tape on the reinforced area;
Mark the centre of the hole with a pencil;
Put a slim piece of wood up the of the pole so it sits under the area to be drilled, this will safe any nasty accidents to the opposite side;
Use a 2mm drill bit (drill bits should be sharp) and a battery drill to slowly and gently drill through (don't push let the drill do the work);
Incrementally increase the hole size with larger drills (I typically go up 3.5, 4.5, 5.5, 6 for a 7mm hole);
Take the scrap of wood out now :wh;
Using a strip 240 grit garnet paper wrapped round a drill bit shank, twist into the hole thus enlarging it gently and this will give a very clean and circular finish (sometime the drilling can leave the hole not quite round);
Increase either the drill bit size or the number of 240 grip wraps testing often til you get a perfect fit;
For the map ones I super glue them in;
Job done!
NOTE WELL : apparently failure to remove the strip of wood at the correct time can allow it to slide up into the section, be forgotten about, and after the side puller has been glued into place it is impossible to remove :doh:
