What battery are you using? If it does not have the small button on top you will have to push the firing button in further. Before DH and I switched to the AW IMRs we were using BDL high drain that did not have a button top. For DH, with his long, skinny, ar
thritic fingers, I had to get some tiny rare earth magnets, the same size as the button top AW IMR's, so his fingers wouldn't get so stressed.
I was doing the same, for one of my Mini;, and then, all of a sudden it "decided" it didn't like the magnet so I stopped using it. By that time the button/firing pin had loosened up enough that it wasn't as hard to push.
I used the rare earth magnets whenever I felt they were needed. At first I ordered four AW IMR just for DH to carry on his
three days out of town because they don't self-drain as fast as the BDLs do. I was so impressed with the difference between the AW and BDL I then ordered four for me. I just ordered four more, which is 12 between the two of us. That's not too many or too little; just the right number.
And I agree with what others say about pushing the button harder than needed; many of us have done that AND it could also be stiffer than "normal."
Alice