I'm assuming that "firing" was meant to be "fitting".
Sometimes they require adjusting the tabs. Per Kodak vintage instructions, the tabs can be adjusted +/- .5mm. Since Kodak adapter and others are aluminum, bend gently and not too often to avoid tab breakage. And bend them evenly all teh way around to get a good fit that is noeither too loose nor too tight. If you have the right size, series 8 size 2 1/2 in - 63.5mm slip-on adapter for the 12 inch Commercial Ektar, the amount of adjusting will be minimal. If you have the wrong size, it probalby won't work.
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