To the best of my knowledge, the way a single stock futures - SSF contract works. Let's say xyz stock is trading at $40 as 1 SSF contract is 100 shares. The cost of SSF contract will be $4,000 (1 contract = 100 shares x $40 per share in xyz = $4,000). But you only need a margin of 20% of the contract at $4,000 which is $800. So $800 gives you the buying power of $4,000 which is 1/5 buying power.
I hope I have helped you understand how SSF's work
If any of this is incorrect please someone correct me. I have not traded in SSF's but have read information on them which I believe to be correct.
UPDATE: Something I forgot to mention, with SSF there are downtick and upticks like in indices, but the minimum uptick or down tick is 0.01 cents. You can instead exploit the bid and ask price. Profit from between the pennies. As each contract is 100 shares, each individual share is worth $1. So in the above example I gave with the stock xyz trading at $40, if the price was to go up to $40.10 cents. You take 0.10 cents and multiple it by 1 contract that you have bought and you just made $10 (1 contract = 100 shares x 0.10 cents = $10). So there you go.