Does the expectation of future benefit from a currently bad event prevent the obligation to recite Dayan HaEmet?

May one provide a brief hint or gesture to prevent an actual sin during Torah reading?

Conduct During Torah Reading

Do silver ritual vessels customarily brought to the synagogue on holidays acquire permanent synagogue holiness that prevents their sale?

Synagogue Property Use Restrictions

Should the shoulders of a tallit katan be made wide to prevent side-openings that might break the garment into separate sections?

Garment Size Requiring Tzitzit

Must one raise (or keep lowered) the hands during ritual washing to prevent first-waters from flowing back past the wrist joint?

Washing Vessels and Water Sources

Must a head of household recite Birkat Hamazon aloud so that his wife and children who cannot bless themselves may fulfill their obligation through his recitation?

Mayim Acharonim — Final Washing

What minimum volume of wine from the Birkat HaMazon cup must one drink in order to incur the obligation to recite the after-blessing (Me'ein Shalosh)?

Birkat HaMazon Over Wine