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@EDcasethanks. Any idea what these sizes should be?

@EDcase I appreciate your efforts, but I've no idea how to open an "stl" file. ☹️

@EDcasethanks. It's at 6:40. He's putting 2 parts together, and the bit the springs go into is the one 👍 I've added additional photo to the post also. Can't access the parts list unfortunately 'forbidden'.

Seem to have lost a part for my P90 and can't find how to source a replacement. Contacted Cyma but they refuse to help non-professionals !! Not sure what the part is called but it joins the upper & lower receivers. Rough drawing from memory attached. It fits over the 2 springs in photo. Anyone offer any guidance as to how to identify and/or source a replacement?? Thanks