"igor" wrote in message

What if I used another clamp to squeeze the trigger of the first clamp?
TIA. -- Igor

That simply means you are using the wrong clamp.

Quick Grip clamps are OK for a quick holding, but IMO, they are not well
suited for serious work. I'd much rather use a Bessy K or F. Even the
lightweight UniClamps are better but come in size up to 18".