My Thumb has a Vag...

Just snugly bind the tip of your finger with a bandaid or medical tape. I build model planes, and occasionally the scalpel-sharp X-acto blade slips...yeah, been there, done that, still fapped.

Wait for you hand it heal. It'll feel better.

Make others do it for you

well just dont and let it heal XD

looks like you need this more than me.

That's very effective

Pain is so close to pleasure.

No it isn't.

O__O
wow...*hug*, it seems like you need one right now.

One of my cousins have something like that for his masturbatory needs - surgical gloves.

Get a pillow,

The rest is up to you.

Read the Hentai then close yer eyes and imagine then fap away...

Ambidexterity is weird...
well my form is weird I can't write with my left hand but I can perform more precision things with it
The right however is used for writing and most endurance based tasks

Instead of using books for hentai, use Fakku!, isnt this why your on the forums?

That's not the simplest solution. Finding a girlfriend doesn't always work out as you plan. Then there's the whole matter of getting her to engage the target. All told, unless he hooks up with a slut, his finger would probably be healed by the time he gets some action.

First off, there are a few easy ways to resolve your predicament:
1) Endure the pain. It really can't be that bad. One time I had a nasty cut on my index finger right near one of the joints. I just threw a band aid
2) Use your other hand. Its not that difficult. Even if the positioning and angles throw you off, its very easy to adapt.
3) Do it hitchhiker style and stick your thumb out. It might help with your grip, but the thumb isn't all that necessary, at least when fapping.

I think you should use your imagination. Don't look at your thumb vag as a problem, look at it as a learning experience. The standard fapstyle is effective, obviously, but its not the only way. Be creative, have some fun, maybe you'll create some kind of fap device that you can sell.