Hi all,

I recently acquired an old Parker Vacumatic on ebay, with a busted diaphragm. It seems that to replace the diaphragm, one needs a special tool to hold and unscrew the plunger . I don't have it and do not wish to acquire it for just one pen.

I tried unscrewing the plunger with a small wrench but it doesn't work and I feel that putting more pressure would damage the threading of the end cap.

Has anyone succeeded in unscrewing the plunger without those special tools?

For now, I bought a new diaphragm, folded it into itself and thrust it down into the barrel after unscrewing the nib end. It works beautifully now, but as an eyedropper. I would love to get the real vacuum filling going.

Any advice will be appreciated.

Thanks