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Double Bass Changing Nut Height

From reading others articles i'm quite certain my strings are too high at the nut. I've read recommendations of one business card thick. Mine is 4 cards or .035 with a feeler guage. I've adjusted nuts on my mandolin and guitar by removing the nut and carefully sanding the bottom of the nut so I don't mess with the top part. All my strings are the same distance from the fingerboard, so does this method make sense on a doublebass? Please let me know if this is not a good idea. Thanks!
 
I have seen that method used on double bass by a violin guy...either placing a shim under the nut, or by removing material from the bottom of the nut.

Personally, I think it would be much easier to lower the slots with a file, then reshape the nut accordingly. No gluing/clamping involved.
 
You can first dress the top of the nut down with a fine rasp or coarse file, then re-groove the string slots with a needle file. Finish up with 220, 320 paper. Use plenty of pencil lead in the grooves before you string the basss back up. One business card thick is a good idea.

Removing the nut is not needed. However, keeping the soundpost up while the strings are off is very important. Use a canvas bag of buckshot or a nylon strap clamp around the body of the bass.
 
thanks for all the advice. I followed it and made the adjustments on the top. You are right, the nut may not come off as easy on an upright as a mandolin. The madolin and guitar just pop off very easy and you don't even have to glue them back down if you want cause nothing moves anyway. Anyway I took 2 hours and very, very, carefully moved them down to one business card height. I will try this a week before I touch the bridge as I see my action lowered just a little down and the bottom of the fingerboard. From what I've read, you should always do the nut first, then the bridge. Hope I'm on target. Thanks again.