And this is the lock I try to open (I checked it's 7 pin) :
And with the practice key I can put it in the lock but cannot turn it BUT with my 7.8 radius key I cannot push it in while I can do that with my practice slot …
If I look at my key it's got a hole inside
while some other keys I see on the internet have a bar or something : 
I notice there were some extra parts with my keyset, this image below being some extra parts
, I tried to put those in the hole but it doesn't stay in, I don't even know if it's purpose is for that ??Any help as why it doesn't even get pushed in is it another security in these machines ??