Managed to track down the missing length of SP 41 and discovered it was exactly the right length for Cubester's rear mech. At the same time I researched the MRP chain guide, and discovered I had got the right one after all, I just had to dismantle it to fit it. So this morning was spent changing the outer cable ( and of course now the inner was too short, so that had to be swapped too) and fitting the chain guide.
He also brought home a mate's Carrera Banshee which had an inoperative front brake. That's now had its front caliper dismantled, as it was completely contaminated with brake fluid. I've reseated the bleed nipple, removed the now junk pads, degreased the rotor and freed up the seized the pistons. Flushed with new brake fluid and bled, but the hose weeps at the reservoir/lever end, so new inline connector and pads ordered. I hate to be a snob, but that is one horrible heavy clunker of a bike. Typically, the seat is slammed right into the tube, the rear Raidon shock has no air in it to speak of and the fork stanchions are showing signs of rust in the chrome finish. The Clarks Skeletal brakes feel very wooden. I don't know how to break it to the owner that its heading for the scrap heap unless they spend a fair amount of cash on replacement parts.