there are literally 100 different ways to finish a single leg. no one technique works all the time. you have to use the finish that best applies to the pressure youre getting from your opponent's defense.
1. bunny hop- pull teh single toward you and reach for the far knee
2. dump- inside head pressure, big circle step with you back leg, dumop him on his butt
3. reach around- far arm goes to thigh, near arm around waist, back heel trip
4. front trip- use leg to block about teh knee and shove opp forward
5. back trip- if head is on teh outside, blockbehind knee and shove backward
6. lawn mower- pull leg high into the air in a lawn mower motion
7. shoulder trip- keep raising leg, put it on you shoulder, perform back trip
8. switch to double- head is on outside, step across for double
9. oklahoma or navy- head stays inside, near leg wraps, far arm shoot through (watch out for spladle)
10. lift- drop hips, pick opp up crack down or slip out
i know these are extremely vague and dont help at all, but it gives you an idea how many ways there are to finish a single. its best to learn 2 or 3 finishes that work well for differnt defenses. then take what is given to you. for example. if your opponent lets you have the leg but pushes you head away, teh bunny hop works. if they hip in hard and whizzer, oklahoma. if they try to square up and sprawl, switch to a back trip.