Knurled nuts for change gears

Guess you have to take the "bad" with the good... i would have really loved to buy a machine which i did not have to change any gears (aside form inch and mm), but my pockets are not that deep :)

So to make changing the gears a little easier i made up these nuts, now there are no tools required.

They are made up from mixed stock, a couple are from lead-loid and some from 303 (i think)... the knurl came out good on a couple, not so good on others, but they work.