288xp pump ?

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Am I missing something here?
You have a supposed 288 oil pump second hand, a new worm drive and a pump known to be 288.
Can you not compare the two pumps and see if the worm fits the known 288 pump?

Maybe someone slipped you a 61-272 pump by mistake?
Yes the worm does fit the known 288 pump but the new o e m Worm Drive is a fraction bigger then the OEM worm drive with that pump I believe the pump that I have that was sent to me uses a brass Worm Drive and he must have sent it to me by mistake I was hoping someone had more knowledge than me and could recognize the pump that he sent me
 
Not sure, but I believe the brass and plastic worm gear are interchangeable.
I believe I replaced a screwed up brass one with plastic on one of my own.
The part number on the worm bag is correct for 281-395 saws.
I can measure the bore on a few pumps I have here.

EDIT: 3 known 288 pumps measure 29.65mm average bore diameter
 
Not sure, but I believe the brass and plastic worm gear are interchangeable.
I believe I replaced a screwed up brass one with plastic on one of my own.
The part number on the worm bag is correct for 281-395 saws.
I can measure the bore on a few pumps I have here.
I reached out to the man that I bought it from he is very knowledgeable in chainsaws and he thinks he might have accidentally sent me a 181 SE
 
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