I purchased two of the Dernord 5500w ripple stainless elements with integrated tri clamp flange and L6-30 connector on Amazon. Has anyone had difficulty in mating these with a female L6-30 twist lock receptacle? I have no problem plugging it in, but am having big issues unplugging the cord from the element afterward. I suspect the prongs on the element aren’t exactly the right size/shape that they should be, causing it to get stuck in the receptacle somehow. I’ll have to compare the prongs on the Leviton male L6-30 plug that connects to the control panel itself with the prongs on the element. I hate to have to reshape the prongs on the element, but what’s the point of having the connector if it can’t be easily unplugged to free the cord from the kettle?