I'm not sure I understand your question.
I have encountered two physical types of 30/15 adapters. One is a very short cord (about 8"). The other is like a double-thick hockey puck. Both have a 30-amp female connector (i.e., socket) one one side, and a 15-amp male connector (i.e., plug) on the other. Which do you have?
If I understand your question, the blades on the male side of the adapter (the 15-amp side) are of the expected thickness and the expected width, but are too long? Is that right? And what is the resulting problem? Perhaps the plug won't go all the way into the household wall socket, leaving some of the blade exposed?
I haven't encountered a situation that sounds like yours, but perhaps I am misunderstanding your description. Anyway, it sounds like you have solved it, and are ready to roll.
Bill
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