Little Al
Addicted to ArboristSite
I have used an end mill to cut holes/slots in a bar without any need to annealing the bar rails on the one I did was only hard to just below the bottom of the chain slot + it was NON laminated I filled the holes with epoxy mix I must add it was then fitted to shelf queen limited use saw. Having said that some of the now vintage saws had a number of various sized holes but for the OP's need not recommended Smaller saw/bar Or a better method get someone else to carry itBy the gods NO!, HARD stuff bars are, to drill them you must first anneal it then drill what you want, then retemper it to get it back to usable. Oregon also makes some nice light bars in lots of size's
Cary