my better half makes her own coffee syrups and put's them in ball jars. Michael, my son took some scrap Delrin and made a pump cap. If anyone is interested it seems that the pumps use a 4mm buttress thread.
Give us another angle. I am thinking the piece is a circle, but from the way it is shown it looks just like a walker ski. I working maintenance in a nursing home, btw.
It does look like a walker ski !!!! Yes it is a circle, goes on in place of the seal cap under the nut. I'll take another pic when I get home tonight.
I don't know anything about machining, but I think sometime I would like to stop by your place of business. Not to far away.
Oh, the pump IS a syrup pump by the way. Don't want anyone thinking he used one off of laundry detergent or ..........