All the problems Norm with float needles ,if the old seat from an old primer cap was swapped into the new cap I think you mostly wouldn't have had a problem but you don't expect new caps to have a faulty seat.
I've never seen that MSAA equivalent Echo snipper with that carby ,I have a few MSAA trimmers but not like that.
After I was thinking why isn't there a float needle carby on a trimmer I found a Michigan 47cc Brush Cutter that was sitting in the backyard for about 5 years.
I hadn't looked at the trimmer until now , cleaned the carby out ,and got the trimmer running.
I've had hundreds of trimmers, even a couple sheds full to the roof, but only seen the Michigan trimmer with a float needle carby until now with Tyler's MSAA trimmer.
Most of my trimmers are gone now but probably have 50 ,must get that number down.
Just as a side note ,the yellow fuel can I thought was a strange shape but a fair while ago I was reading somewhere that they are made that way for a reason, instead of lifting the fuel can to fill up a smaller can you just roll the yellow fuel tin side ways to pour the fuel out .I'd never thought about rolling the can to pour the fuel out before. If anyone else has a fuel can the same and hasn't thought about the shape that's why the can looks a little strange.