Failure at putting together my battery pruning saw

 When my 13 inch curved hand pruning saw started getting dull I looked for replacements and the first thing I saw was battery powered mini chainsaws.  I had to have one, I would be able to get done in 5 minutes what took 30 minutes by hand when I'm clearing out buckthorn. The problem is that the chain jumps from the power sprocket at times.  Three pieces have to be held in position at the same time; chain, chain bar, body of saw.  It usually takes me 30 minutes to get it done once home. Field repair is impossible. Usable bar length is 3.5 inches, although I have gotten a 5 inch tree down. Weight about 7 lbs.

And then I put it on the wrong way and had to redo it.