Long term storage

[cbwx34]

Here is my answer from support:

"The older model had the drive pin recessed 4 mm in to the drive wheel. When the drive wheel did get really hot it could crack.
We then move the drive pin to the centre (14mm) of the drive wheel to have more material surrounding the drive pin.
Therefore if you use a new shaft with an older  drive wheel the recess is not deep enough to seat the drive wheel against the shoulder of the main shaft.
That is why we drilled two holes on early model MSK -250. 4mm and 14mm from shoulder.
We now have stopped drilling the extra hole. If the customer have an older drive wheel they have to drill the hole them self.
They can buy a new drive wheel if they don´t want to drill the hole. This is what we recommend because of the stronger design and the fact that the older drive wheel is starting to get brittle and can crack."

The new shaft drilling does not quite follow the Tormek policy of non obsolescense, however, I can see the reason for the change. The new drive wheel really is much sturdier. Hopefully the bump in your drive wheel will work itself.

Ken

I guess I inadvertently dodged a bullet, that I'll have to address at some point.