[cypher]

It can take a while for some hams to get used to hands but three weeks isn't that long so it may be that you need to go slowly.
Sometimes it can help to let them climb into a tube so they can then just walk over your hand when they come out rather than just putting a hand in front of him, burying your fingers in substrate or under something & laying a treat on your palm can sometimes work to & help them get used to hands.
I think you just have to take your time with him & find what works best.
Sorry if that's not too much help but they are all different & the same techniques don't always work for every ham.
Someone else may have more suggestions for you.