Originally Posted by
JRat
Thank you for the advice and suggestions. However, as I'm in UK I've decided to first try what is available here so I've ordered a 2-piece front clamp unit (item B07T4KTZBD from Amazon UK) as it's both cheaper and quicker to get than something from Asia. If it becomes obvious that it won't work then I'll have to move to a more expensive solution.
Most likely you will not be able to prevent the mounting finger from rotating in that adapter. Even if you initially have some success, the tab that acts against rotation will soon shear off. Maybe the design could have worked if these units were made to a higher precision, but they are not.