Thanks for that ! I also like to tweak 1/4 inch at a time. But what I do is use these plastic channels that you put under appliances like fridges when you want to move them on hardwood floors or ceramic etc.. Spikes on carpet are hard to move precisely I find , so using these under the spikes, I can move my speakers in very small increments without having to lift them at all. Then when I have it just right, I take out the plastic rails..
Acoustic Zen Adagio, Veritas center, Axiom EP500, QS8s, Anthem AVM20, MC20,Adcom GFA7400