If you’re making Old Reliable but omitting the additional Ether, then the Collodion is too thick and will not flow correctly. Why omit the Ether from...
The slot looks very specifically machined behind the aperture ring and the seller told me it is for filters. Which I can't see any other evidence of...
Removing the lens board makes no difference. The only thing I think would work is if I reverse the elements and have the barrel mounted on the inside...