Going on in Flesch’s Scale System we stumble upon the double stops. So let’s begin with the thirds.
As usual he published just one version, so we have to adapt this part to our requirements:

We start with a slow speed to adjust our intonation. If we are not that experienced we will almost certainly run into problems. Those intonation deficiencies can be solved by breaking up the thirds like this:

Please remember: At the beginning the speed is of no importance for us. It’s precision that counts.
If you did well you can increase the speed like this:

There are different opinions concerning the bowing. The published version differs from the above, but personally I prefer “my” version because the training effect is better when it comes to the connection between the thirds.
In other words: It’s more difficult to play thirds on one bow than separately.
Play them from beginning to the end of the scales like this, then double the speed:

The principle remains the same, just the tempo changes. Bowing speed remains as well.
It will be difficult to accomplish these thirds, but it’s worth practicing them. So have a little patience with yourself!
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