I've stayed off this thread all day, but there's clearly a bit of confusion over the 2010 chainstays. Firstly, we're not charging people for chainstays if they have a genuine warranty problem, they get a free replacement. What we are doing is offering the new stays to any Hemlock owners 08 or 09 vintage should they wish to put the new, much stiffer, chainstays on their bike. There's not a huge difference to the 09 stays in terms of stiffness, but it is there. Compared to the 08 chainstays, there's a massive increase in stiffness which in my opinion improves the ride and handling, so those people can upgrade. It not a required purchase, it's just an option.
As for the change in design, it's completely different in the area affected by the assembly issues last year. There's no slot on the drive side, the slot it out of the load path and doesn't require the washer on the non-drive side therefore making it 'idiot proof', the machined relieving has been deleted and the webs from the chainstay tubes run up into the pivot area now increasing stiffness and strength. Compared to the 08 swingarm, which has never had a failure and is 95% the same as the 09 version, the 2010 swingarm is hugely improved here. I didn't take any chances.