Help!Rhinestones,Blend tool,manual distance placement

Hello kind people!

I m very new to CD and i was assigned to do a project about/with Rhinestones! My question/s after watching few related to subject tutorials is/are:

After creating the stones,adding them to my path then blend along path,is there a way to put A distance between the stones?Adjusting the spacing doesn't really help me as i cant see the exac distance between my stones.

For instance, if my stones are 3mm wide i want them also have 3mm distance between them,is it possible to do that automatically or with some trick ? I m not sure how to do it manually as i don't know how to measure the distance all the time between the stones,plus with bigger projects the more time it would take me to do it.

Sorry for the bad English ,still learning! Ciao Smile