On Thursday, 30 April 2020 11:37:57 UTC+1, Dave Plowman (News) wrote:
In article ,
tabbypurr wrote:

Interesting. Last time I used those, long ago, they severely distorted
the sheet they were punching. Is there some way to avoid that?

Get some decent quality ones? If the tolerances are poor, it won't shear
accurately.

The ones I was using were the Qmax you recommended.