Snapping snaplock pipe?

A few weeks ago I bought several 5' lengths of 4" 26 ga. snaplock pipe from a guy on craigslist. The lengths are curved into unsnapped cylinders, about 6-7" in diameter. Just one question: how do I snap the damned things together?
TIA, Vince
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Vince Heuring To email, remove the Vince.

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I found getting it started was the biggest pain , but when you get it started the rest went in easily by grabbing it with both hands about a foot or so apart and squeezing it together. One edge should curl under the other and snap into place when you release pressure .
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