New cowl fasteners

[Trippster]

So I bought all new stainless steel fasteners for all the cowls and avionics access panels. I tripled checked and I have the correct ones in the right position according to the parts manual. Most of them are a little tight/tough to lock, but they do. However I have a couple on every panel that just don’t seem long enough and won’t lock, no matter how hard I push them in.

Does anyone have any experience with this and/or a fix for the few difficult ones?

Thanks.