It's been a while since I've had Little Giant hammers in my shop (went to an air hammer), but if I remember correctly, a proper concrete base for a 50lb is a lot of concrete, with recommended rebar reinforcement. For many years of running both a 25 and 50lb in my shop, on a "dirt" floor here's what I did...... purchased some RR ties (since I had two hammers, I purchased a total of 4 RR ties).....cut each one in half (this will give you 4" (approx) chunks of RR tie), place 4 pieces sides by side, and bore 9/16" hole through all of them....approx 1/3 of the way inward from each end. Then, using either 1/2" all thread, or 1/2" mild steel rods threaded at each end, "clamp" all the ties tightly together, then sit the hammer on top of the "platform" you've built. In "dirt" using the hammer will slightly "dig" the platform into the ground. On concrete it will distribute the force out over a wide enough area that you can place it on a 3-4" floor. On concrete I've seen the entire hammer/platform "walk" a bit when you really get after it, and if that happens, you can always hold it in place with some large pieces heavy angle iron, and concrete anchors. After building a new shop, with concrete floors, and in-floor hot water heat, I sat the platform/hammer right on top of the concrete floor, and mine never moved.
