Thanks Tony. I have a pair of round nosed pliers, tapering from about 1 mm diameter at the tips to 4.5 mm at the base. Otherwise I use drill shanks for larger radii. With sand pipes, it's figuring out the orientation of the various bends in three dimensions that I find the worst.
Anyway, I've completed the pipes. including some tweaking after fitment and, as far as I can see, that's the loco chassis complete (except for the tender draw bar). It's been re-assembled - quite tricky to get the keeper plate into position whilst engaging the tails of the sand pipes into their guide tubes.
Here's the loco in it's most complete state yet and it does look a bit like a B1. The chimney and dome are just loosely placed.


On with the body next. I can't decide whether ot not it was painted by Bachmann. It's obviously moulded in black plastic and a brief trial with Phoenix Precision stripper had no apparent effect. However, the Bachmann Ivatt tanks body, also in black plastic, had most definitely been painted, as I discovered when I used cellulose thinners for degreasing, fortunately with no irretrievable results. On another thread, someone suggested immersion in a caustic soda solution, so I might try that before starting on the detailing.
Dave.