<p>Thanks for your answer Michael. I don't understand (even after looking at those links) how if the mounts are deliberately not compatible that when mounting them to a modern adapter that they both work. But then I'm not the brightest bulb on the tree.<br>
<br />But if you've used both on yours, I'll assume they all work like that.<br>
<br />btw, your have a lovely brick wall ;)</p>