installing into 4U rack

[jezisek]

Yesterday I have firstly used my Receptor during live performance with our band www.desetoci.cz.
Receptor is installed in plastic rack case from Proel. During transport (80 miles) there was
some vibration in our car (as usual).
After unpacking I recognised, that rack adaptors (supplied with Receptor) are flowing. So here is my question. How do you suggest to fix Receptor into rack to be firmly attached to case? Only two holding points on front panel are not sufficient and there is a risk of evulsion !
How solves gripping technicians from U2, Garbage etc ... ?