Locks
We start our training with one elbow lock and one wristlock which we practice regularly:
hiji waza - elbow - ikkyo or oshi taoshi
tebuki waza - wrist - kote gaeshi
if you only ever learn these two moves, they will work for you in real fights if the need arises.
From each of these we build a set of 5 hiji and 5 tebuki waza.
Beyond that we develop from the secondary and tertiary lists.
Hubud lock set
In hubud we have a list of 5 locks we practice which work in real time:
ikkyo
ude gaeshi
waki gatame
kote geashi
sankyo
and one appendix - oni kudaki - which we apply from the inside.
Irimi and tenkan
With regards to irimi and tenkan in lox, we start examining this concept with ikkyo
Ikkyo irimi - take the elbow through uke's centreline and cut to 3rd point
ikkyo tenkan - step back and spin uke round and down.
Both turn a pin technique into a projection. Perfect examples of henka from a basic technique.
Once these concepts have been learnt in the first lock, they can applied to further lox as you develop.
Another way of looking at is is this - once you have irimi and tenkan you now have 3 techniques, all variations of ikkyo.