Also, while it's possible to screw into particleboard it's not highly recommended, as due to the makeup, particleboard tends to tear itself apart when you apply torque.
Best bet is to go with fhqwhgads' suggestion and attach a piece of wood to the metal framework, although I'd recommend glue rather than screwing it onto the particleboard. Again, make sure you clamp heavily. Note that you may need either a shim or cross beam of some sort though if the frame and the bottom of the desk surface aren't level.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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