I've noticed that some teams will install chunks or strips of metal on their robots as counterweights to keep their robots stable or balanced.I wonder if this is legal and if so,is there any Specification limit of the counterweight.
Please review the Q&A Usage Guidelines, specifically point 3, "Quote the applicable rule from the latest version of the manual in your question.".
There are no rules which would pertain to, or prevent, this hypothetical Robot design choice. Therefore, it is legal.