To simplify things ,the 17 pdr ordnance and recouperator were standard 17 pdr, the cradle, saddle and carriage were standard 25 pdr (British) the modifications were, increasing the opening in the shield, a bespoke firing linkage and guard and the upgrade of the firing platform by boxing in the angle spokes and reinforcing the outer ring.
One very good question would be ,why does the 17/25 pdr require a firing platform ? when in a direct fire role.............................well I believe that it is as much for ballast than anything else !
Rob..............................rnixartillery.
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