Hi Bibbt,
The way the slide mechanism is designed, it needs to have some play in it to let the standards slide freely. It could be that the play you're seeing is how it came from the factory. The amount of play can be adjusted, but you may find when it's reduced to a level you would like, the standard will bind. The important thing is that there should be no play when the locking lever is tightened.
Adjustment is done with the 2 Philips head screws on top of the carrier. You need to remove the stop block at the end of the L-standard's extrusion and slide the standard right out of the carrier. Loosen the 2 nuts that lock against the dovetail guide. One requires a 5.5mm wrench and for the other slotted one I ground a screwdriver tip to fit. Insert the standard and adjust the screws carefully until you get the desired feel. Remove the standard, tighten the locknuts, re-insert the standard and test the fit... repeat if necessary.
You can probably do this procedure with the main rail clamped on a tripod, thus avoiding removal of the carrier from the rail as I've shown here...
Good luck!
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