Quite correct, don't move at all. The whole spec says it was intended for someone who was a died in the wool hammergun user who fancied the idea of an ejector. It was ordered by a corporate body for someone who doesn't appear to have been of any obvious significance, certainly not an officer of the company, more likely an important customer. It was also specified to have a knob on the t'guard like a Jones underlever but that bit apparently got cancelled! It would be great to know the story behind it but we will probably never know. All the alterations were apparently done on a completed SLE, there are strike marks in the internal colour hardening where the hammer fixings were struck off and the safety push rod still had the file marks across its end!