@kaputnik, I did that once. I built a spring-loaded parallelogram with about +/- 25mm of compliance to carry my ATC2K on the front of my bike, but without the elbow joint since I aimed by pointing my bike. As Steadicam designers will know, the damping has to be surprisingly high and spring rate surprisingly low to accommodate the mass of the camera and provide the slow but controlled response. LEGO's suspension parts were entirely too stiffly sprung for it to work well, even by adding extra weights to the camera.
I've seen a two-handed unit made out of plumbing parts to carry a Handycam with its external monitor active. You held and aimed it a bit like KITT's steering wheel. But Steadicam does make 'prosumer' models that are non-articulated; I seem to recall that they featured a long reverse hanging arm with a weight on the end.
@anth, does the balljoint support something above it, or have something hanging from it? A universal joint might work as an alternative. I'd try looking in the RS catalogue rather than Screwfix, and you'll find rod end joints and rosejoints and all that stuff. Or buy a really cheap balljoint tripod and cannibalise it?
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