Hey Rob, everything associated with the blade holder has broken at one point or another, the spring, the metal de-dent spring, even the bolt that holds it together, also the bellows split so the air wont blow the sawdust away. You also need to keep an eye on the on switch, unbelievably the bottom of it, where the wires connect, is not covered so all the sawdust junk etc gets stuck to it and eventually you have to pull it out to clean the contacts or you scrollsaw wont work. Also had to replace the switch when it went as well.
Roly, the General 21 looks like the Excalibur to me, so it looks like I will go with that. Back when I first bought the Q3, about 25 years ago, the scrollsaw I really wanted but couldn't afford was from a company in the UK called Excalibur, for a Scrollsaw called the same, it was pretty much hand assembled and their only product, back then (early 1990's) it cost nearly $3000, in today's money about $4500 or more. They went bust and sold their scrollsaw design. Guess what the new Excalibur is an exact copy of?