Greetings. I recently acquired a Rodenstock Sironar 240mm f/5.6 in Copal 3 and have a problem. When attached to my Chamonix 045n-2 the aperture slider rubs the wood trim on the bottom of the front standard. It is in a cheap lensboard from Adorama. Is there a thicker lensboard I could buy or do I need to add something to my existing board to make this work? Thanks in advance.

Joby