This is purely for info but the MLAGB now stock consumables for black powder guns. We are agents for a German company called Guenter Stifter (http://stifters-gunflints.de/shop/main.php) and can source anything (of a non explosive nature) from his catalogue. Postage is at cost and we have nipples and wrenches in stock.
We currently have 3 different types of nipple: For original American revolvers, repro revolvers (6mm x 0.75) and underhammers (6mm x 1).
Two different types of nipple key are available from stock: short, to get at a nipple without removing the barrel and long ones that clear the cylinder for revolvers.
We've also got stock of the cleaning patches in three different sizes.
PM me with any requirements and I'll price the items for you.