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Replacement spring for most rollerball style pens. Sold individually or in packages of 10.
Hi Doona, Most rollerball pens do have springs, But I am not familiar with Montifore. We deal in pen kits (wood turning), not commercially made pens. You may want to contact a pen dealer - Jet Pens, Farneys, Andersons etc. They would be able to assist you better than we can.
Hi Jeff, The KoJent is a WoodCraft pen, so I am NOT CERTAIN. But I think it is the Berea Atrax. I checked that pen and yes, the standard rollerball refill spring will fit fine. You may have to stretch it a bit, but that is not unusual for many rollerball designs. Give it a try!! Ed