A machine system comprising: a roller frame (22,122); a roller assembly (30,130) mounted to the roller frame (22,122) and including a roller shaft (32,132) defining a longitudinal shaft axis extending between a first roller shaft end and a second roller shaft end, and a roller body (40,140) rotatably positioned upon the roller shaft (32,132); the roller assembly (30,130) further including a first clamping collar (48,148) and a second clamping collar (50,150) positioned, respectively, upon the first roller shaft end and the second roller shaft end, and each including a lower collar section (52,53,152,153) and an upper collar section (54,55,154,155); the first clamping collar (48,148) further including a first fastener (56,156) clamping the lower and the upper collar sections (52,53,152,153;54,55,154,155) to the first roller shaft end to form a first static seal (58,158) extending circumferentially around the roller shaft (32,132); and the second clamping collar (50,150) further including a second fastener clamping the lower and the upper collar sections (52,53,152,153;54,55,154,155) to the second roller shaft end to form a second static seal (62,160) extending circumferentially around the roller shaft (32,132); characterised in that the roller assembly (30,130) further includes a first pin bore (74,174) extending through the first roller shaft end and each of the lower and the upper collar sections (52,152;54,154) of the first clamping collar (48,148), and a second pin bore extending through the second roller shaft end and each of the lower and the upper collar sections (53,153;55,155) of the second clamping collar (50,150). a roller frame (22,122); a roller assembly (30,130) mounted to the roller frame (22,122) and including a roller shaft (32,132) defining a longitudinal shaft axis extending between a first roller shaft end and a second roller shaft end, and a roller body (40,140) rotatably positioned upon the roller shaft (32,132); the roller assembly (30,130) further including a first clamping collar (48,148) and a second clamping collar (50,150) positioned, respectively, upon the first roller shaft end and the second roller shaft end, and each including a lower collar section (52,53,152,153) and an upper collar section (54,55,154,155); the first clamping collar (48,148) further including a first fastener (56,156) clamping the lower and the upper collar sections (52,53,152,153;54,55,154,155) to the first roller shaft end to form a first static seal (58,158) extending circumferentially around the roller shaft (32,132); and the second clamping collar (50,150) further including a second fastener clamping the lower and the upper collar sections (52,53,152,153;54,55,154,155) to the second roller shaft end to form a second static seal (62,160) extending circumferentially around the roller shaft (32,132); characterised in that the roller assembly (30,130) further includes a first pin bore (74,174) extending through the first roller shaft end and each of the lower and the upper collar sections (52,152;54,154) of the first clamping collar (48,148), and a second pin bore extending through the second roller shaft end and each of the lower and the upper collar sections (53,153;55,155) of the second clamping collar (50,150).