Why does this parametric block break when I copy it?

I don't use blocks like dynamic blocks, but do you not need to add coincident constraints to keep everything together?

@jcclow, I inserted your drawing and then copied it a few times,

and it scaled, rotated and stretched without any issues.

I have attached the drawing with your blocks in.

As I said, I don't use dynamic style blocks, so I may be doing this wrong.

Excuse my ignorance, but I also know nothing about breaklines, so why, when you stretch it, does the squiggle part scale up as well?

I would have thought that was what your scale action was for?

Apologies for my stupidity :-)

Hello.

Maybe using a simpler geometry and parametrization could be a solution for this case - see attached.
This would allow to separate the selection sets of operations and make it easier to get the result as expected.
This means that the effects of operations will no longer overlap.

One reason for such an approach is that the point of application of an operation might also move, depending on selection sets.
For example, with the original configuration, the rotation grip moves when stretching.
However, this also moves the rotation center, which, further, has a negative impact on the geometric configuration.

Another important factor is the underconstraning - this can lead to configurations that are correct but not as expected.

Concerning using grips, if you have access to dynamic blocks, you could experiment using them for cases like this - they include more grip functionalities.