Top is firm, rubber mallet can be helpful for those with less strength, I use my lids on buckets of liquid bee syrup. What may be helpful is purchasing an apex wrench to tighten and loosen the apex.
White Gamma Seal Lid Pack
3 Review
Temperature Controlled Insulated Material Handling Products: Pack with Confidence
9 Review
Enhanced Performance with Knock Buttress Coarse Thread Gasket: The Ultimate Gasket for Industrial Applications
3 Review
π² Winco UP 13 Stainless Utility 13 Quart: The Ultimate Kitchen Essential for All Your Utility Needs
3 Review