Hi Dan,
Don't know much about the Canadian use of Centurion: suggest Don Dingwall's 'The Centurion in Canadian Service' from Service Publications is a fine start.
The Depression Stop Rail was a hard rubber, raised edge around the outer edge of the rear deck to prevent the main armament from fouling the steel deck during traverse. It had to be modified to prevent the B type barrel fume extractor from preventing depression during traverse, and when placing the barrel into the gun crutch.
Mods to Centurions, as issued from the British War Office, fill volumes. Simon Dunstan is documenting them all, in a mammoth piece of work that he intends to publish eventually.
Mike C
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