So I purchased a 4500 a few months back from the bay. Put it back and just now got to set up and start fiddling with it. Noticed when trying to ratchet the plunger down it stops about a little more than 1/4 way down. Surely this isn't right. I've ordered new o-rings for it. Just wondering if this is the way it works or if something else i may need to look at. When it stops it stops. Iv looked to see if anyone else has had this issue on the forums and youtubed it also. Thanks in advance.