'Is too small!' Growled the Cultist, as he fought to claw his way out of the fog of narcotic oblivion.

'It's fine, one size fits all.' Replied the 'saw bones' as he finished up the stitching.

'...is too short, get me 'nother one...' Slurred the still half-drugged patient.

'Listen, this ain't no forgeworld pal. Unless you want to shopping for a new one up-spire, take it or leave it! At least you'll have a whole arm again! 

*****

No chaos mutation for you!

Whilst the Skitarri arm doesn't look all that much off in the pic, it really does in person. Oh well...I seriously doubt that an incorrectly sized-bionic implant is a rare occurance in an Imperium, much less amongst the shady, back-alley medicaes available to criminal gangs and traitorous cultists!