Whilst in Calgary Military Museum yesterday stumbled upon these........ thought I'd share the pics, there was a lovely cutaway Lewis gun but the reflection of the glass case never did justice for the pics but these weren't too bad.
https://www.milsurps.com/images/impo.../jGinCzX-1.jpg
https://www.milsurps.com/images/impo.../wHWMNR6-1.jpg
https://www.milsurps.com/images/impo.../BAE6U2S-1.jpg