Hello; This will help with an invention idea ive had, i was curious about how to do a small chainsaw (i only saw standard sizes before). How do you intend to provide lubrication, as in bar oil to the chain? The two holes next to the slot that the bolt goes through were for a channel for lubrication of the chain. The bar gets pretty hot with out lube but it's a neat item none the less. Great job! Excellent project. Keep up the good work it's entertaining and educational. You are really good at your workflow and not slowing down. Also, few mistakes, great designs! Just needs some protection around the chain for fingers so you don't touch the chain while it's spinning and around the hand in case the chain falls off.