For me, an important part of the design of this accessory is that it dispenses the fluid in drops. When I first heard of the accessory I could just picture locos being christened with a flood of fluid. The roughly 2 drops per second makes it easy to put the desired number of drops into the loco. I also like the fine control you have of the loader arm. It takes about 9 revolutions of the CAB knob to move the full 90 degrees - making it easy to properly line up the arm with the stack.
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