fgarci03 wrote:You can search "cutaway lock". Many online shops sell them!
But I don't think you should rely on those. I mean, they sure help you figure out some stuff. But it's important that you develop "finger visualisation"
I think you can also be more adventitious with a cutaway, but I do agree that you shouldn't rely on them. Experimenting in different types of keyways is very valuable.
As an example of a little adventure: Of course, you can be tempted to look what's going on with the stacks when things get tricky. In which case, if you do look, you pay a forfeit by setting all the stacks back to rest

That way, you gotta start again. That's the price you pay
You can also tape it up real good, so you can't see a
thing, once you've got some confidence, and/or get a buddy to repin it for you with spools and such. Either way, the short life of a cutaway as useful practice can have an extension .... for a while.