[jyl]

Yeah, cool and all but best left to the nostalgia folks.

You didn’t say your grandkids’ ages or what they might be tinkering with, which will make a difference.

If it is more of a generic wish to introduce them to the joys of tinkering, maybe start with something to tinker on - a kit or model or project of some sort, fitting their interests and environs. And the tool(s) needed for it!

Or a nuts and bolts construction toy. Meccano is still around, I loved that stuff as a kid.

Of course, if you want to march them straight into DIY bootcamp style, you could ship each of your grandkids a toilet and a wax ring . . .