All my life -- long, currently dreary -- I've corrected "ahold" to "a hold," as in, "to get a hold of" someone, convinced that writers who spelled it as one word were, in a word, morons, like those folks who improperly apostrophize, as in "I sent you some photo's of our trip to Yosemite."
So I'm rereading The Naked and the Dead and here's Norman Mailer, no moron -- well, in most ways; let's not discuss his views of women which, as is quite clear from TNATD, are, let's say, a catalogue of Madonna-whore complexes without much of the Madonna part -- here, as I said, is Norman Mailer using the word "ahold" a lot (not "alot").
So I look it up and it turns out that several dictionaries allow this execrescence, so I guess I can no longer automatically consign those who use it to morondom. I suppose it's no crazier than "awhile" -- and I'd never write "come and sit a while" -- so I suppose I can't complain. Even though I still don't like it.
Just in case you were wondering what I thought on the subject.
P.S. Spellcheck does not approve of "ahold."