Timing Belt Pulleys with Machine Key Slots?

[ksafin]

Hello all.

We'd like to use timing belt pulleys on our motors however aside from the pulley provided in the kitbot (which is for 2 belts and is gigantic) there doesn't seem to be any pulleys (to my knowledge) with machine key slots.

Is there a place to get this? Should we carefully carve out our own machine key slots into the pulleys?

Thanks.