For any Jonsered experts, I have a later version 630 in the 715XXXX serial range. I'm wondering if the side cover/brake handle cross up to any Husqvarna saws. It looks like this should be third and final design of this part. I also need a crankshaft, believe it is the fine thread version, same question. Changing out a bottom end on one of these probably doesn't make a lot of sense, but this was my dad's saw and I'm determined to hear it run again! Any help is appreciated!