Steam engines usually have two injectors to drive water into the boiler at high pressure.  The Stanier 8F has an “Exhaust Steam Injector” on the right under the cab, and a “Live Steam Injector” on the left.  The MOK kit has lost-wax castings of both, but the instructions are sketchy about how and exactly where to put them.  When I looked at the engineers drawings, it became obvious that the live steam injector molding was incorrect.  There should be four pipes coming off it or going to it.  Water supply above the outgoing water to the boiler, on the inside surface, Live steam supply at the front, and overflow at the back.  The MOK molding had four places for pipes, but two were on the side and two on the rear.  In looking on the ‘net I had found illustrations of the injectors, and information that Laurie Griffin manufactures very good castings of both exhaust and live steam injectors, so I bought some by mail order.

MOK casting on left, Laurie Griffin on right

When they arrived they were clearly a great improvement on the MOK ones in terms of detail, but the Laurie Griffin one was wrong also!  The LG live steam injector only had three pipe fittings!

The LG one looks better, so I have used that one, fitting the overflow pipe to the bottom of the injector.

When I had put the exhaust steam injector onto the frames it involved fitting the steam pipe from the cylinders.  It is difficult to form the reverse bend at the rear of the locomotive, and I hadn’t bent it quite correctly, leaving the pipe running at an angle down the frames.

The Laurie Griffin exhaust injector molding includes last bend of this pipe, so it gave me an opportunity to correct this error.

However the injector comes in five pieces, which need to be soldered together, and then the four pipes have to be soldered onto the injector, without any of the other joints becoming un-soldered!  It took me all day today, but here are the final results:

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Click to enlarge.  Clearly they have yet to go in place, but I might paint them first – it will be difficult after they are fitted.  The Laurie Griffin exhaust steam injector (on the left in both pictures above) has exquisite detail, so I don’t want to mess it up with a poor paint job.