I have two of these and one is in excess.
It is truly an excellent rail.
The QR plate has to slide in from either side, it cannot be inserted from above.
The clamp will work better with camera plates than lens plates, i.e. it will work better for those plates whose sliding axis is parallel to the sensor plane.
Conditions are excellent, with only faint signs of use, please see the pictures large to have a better idea.
CastelQ_DSC9350.jpg 112.76K 16 downloads
CastelQ_DSC9355.jpg 104.07K 18 downloads
CastelQ_DSC9362.jpg 108.99K 13 downloads
Asking price is £140 Paypal'ed and shipped to the UK (Royal Mail 1st Class).
Shipping at cost for outside the UK.