Monteverde Invincia Abalone/Gunmetal F, Diamine Eau de Nil. I tried a trick I found on Fountain Pen Network, wrapping thread around the grip and sealing it with clear nail polish so that it's not slippery. It doesn't look great but at least I can hold it now. I don't think I'll buy another pen with a smooth metal grip.
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Sliding down toward the nib. I usually grip closer to the cap threads than the nib. I tried winding thread on the whole section but the cap wouldn't fit.That's a clever hack. Did it slip by rotating, or by your fingers sliding down the grip section?