Gamo 440 problem

[slow_runner]

I am missing a piece from the cocking lever on a Gamo Hunter 440.
It is possible that it is on the shed floor somewhere but at this point I have been unable to discover it.
As I understand, it is the same item on the 220.
The air rifle no longer in my possession, it is sold and was shipped broken down. I received an email with the news of the missing piece from the new owner.
The part could have gone missing here or there; either way I will do my best to remedy.
The stirrup acts on the cylinder and I assume that this roller guides the cocking arm on a land within the stock?
If I cannot find it I could guestimate and make a replacement and that might work......
Does anyone have a Gamo that they would measure this piece and post the dimensions here so I can copy?
Thanks a lot.

On this link it is item number 14300
http://www.aceros-de-hispania.com/sp...ir%20rifle.pdf

and seen here...
http://1.bp.blogspot.com/_aNjK3CTQ0D...0/07080906.jpg