Well I have the part in my grubby mitts and man this thing is nice.
Bearings throughout no plastic to be seen, the movement seems to be silky smooth and near as dammit no play, the double pivot arm connects on to the slider with bearings top and bottom, I think this assembly has 15 bearings in total, can't wait to finish work so I can go home and fit the thing,
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Here is a better pic as I had it out of the box to have a tidy look,
You will love it. If the 500 is anything like the 450 it is going to be a tough bird. It will take some light hits but if you plow it like i did then you'll see some damage. Believe me MS Heli makes a great kit that flies really well.