I agree with Roger regarding the step stool, and also about the need to be more above the chain mortiser than for other tasks (both for saftey and fatigue). We found moving the timber to a lower level to be too time consuming, so I devised a platform to stand on while using the chain mortiser. It's just a slab of plywood attached to a frame made of 2x6, but it has a set of spring-loaded wheels just like those on a library stool. It's stable when you stand on it, but once you take your weight off of it, it can roll, so you can easily kick it over to your next destination.

Finally, regarding the outfit in San Fransico that's illegally importing Makita tools - bear in mind that you'll get no technical support, and have difficulty getting replacement parts. I'd be willing to bet that you have no warranty either. CB.