Today played with my Echo cs490. Didn't have my glasses on but the Tension pin (the pin that fits in the bar tension hole) appears to be PLASTIC. I could be wrong but it sure felt plastic. Could be black metal ? Any way I was playing with a Tractor supply bar & chain. The chain oils but heats up. Tension was correct. The drive Links don't have those oil assist holes that allows the chain to float on a film. The saw oils at a tension hole and it was half covered so I'm messing with the bar seeing if that's a problem. I was raised a poor kid and even though I'm not poor anyone old habits are hard to break and it's fun trying to beat the system. Also ran my very old Sthil 024. The thing has a Metal Clutch cover, is very old, maybe 1990ish and is so damn sweet I kept ask if it has a sister. That bar (very old but good) is a heavy duck. The kill switch and choke spring, the one that holds the choke on for starting and makes contact with a wire to stop the engine, seemed to be binding. Dumbass here broke it with pliers. I should have known better. Probably could buy one but, I've got an idea about removing one from another saw for a pattern and trying to make a new part out of spring steel. Don't laugh. I once installed a Ford Pinto (what a fool, Pinto of all things) in a VW bus. I pleaded temporarily YOUNG. At age 30 I had no idea that Pinto engines probably weren't the best choice. Today looking at that old Sthil 024 I realized the REASON Sthil were once (may still be) the best saws we could buy. Those saws were built like Tanks. Back then they were cheaper too. Echo makes a decent old man, that thinks he's a young man, saw,. But Echo saws ( the ones I've seen) look weak and flimsy standing Beside a Sthil. Example. The choke on my cs490, or cs352. Didn't check cs590. So, we were discussing cs4510??? What? Why? And is Echo serious? The cs400 and cs490 are good enough saws. Do we REALLY NEED a 45cc Echo. Ok I get it, let's build a Strato. I'm up for that but why not a BIGGER. Say a 70 cc saw. But, wait. Echo plays the Professional uh, almost, market. Correct me if I'm wrong. Maybe, that 45cc thing really is worth introducing to my fleet. Good day.