On Sat, 05 Sep 2009 15:35:15 +0100, John Rumm
wrote:

you would hence need a 87 degree elbow or similar.

Sorry, I forgot to ask, does such a thing exist as a non-90 degree
elbow. I'm sure it doesn't but I thought I should ask. I've only ever
seen 90 and 45 degree (or should that be 135) fittings.