I don't think the parts have ever changed part # or them being significantly different looking than they once were but different things started happening over the last ten yrs and less in some cases.
The original problems with the switch and still remains to be is the connectors coming off. After a while they would just stop working and if you finally got sick of the connectors coming off and fixed them good then you couldn't unplug it to see if that was the reason they had no spark.
You end up pulling it off the wire on the hill. Now the last 8-9 yrs ago the switches started to separate in two pieces. I believe the last one out of the new saw came apart in the first hour. The saw stops so I snap it back together then it starts happening every fifting minutes then I pull it off. Then the end vibs off. I think one out of three has a functional switch.
That's because I replaced it and its a new non ported new saw and I can't rob it because the wires need fixing again
If the switch works then I won't bother putting a spare choke on as they snap in half like a twig.vI just clean the filter and prime it in the morning then I won't need the choke. Trigger locks use to be rare to break but now I'm lucky to get a month out of one. The vent elbow came out of the tank on one and the other plugged so I pulled it out to clear it. From about 2009 to 2014 I ran ported ground up rebuilds and never had issues with running older chokes other than them poping off. Same with trigger locks. Those two things seem to be in the last 3-4 yrs.
The oilerscseem to be giving me trouble now too.Its sad to see It with fisher price parts. The saw was design in the late 80' but they still had the 266 268 and had the 272 for their next release. I remember the 266 going down in quality in the end when they moved assembly to the USA