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Its a fairly easy knit, done mostly in the round, with simple increases and decreases and some I-cord for the detonators. The pattern could easily be converted for making up on two needles. I used some Tivoli double knit yarn, but as gauge isn't important it could be made with any yarn lurking in the large stash any self-respecting knitter has hidden away for emergencies, along with some stuffing.It took a big of figuring out to get a nice flat face on the timer and in the end I used mathematical formulae. But I was left with some practice timers, one of which converted nicely into an oversized comedy watch...yes, it is totally ridiculous, just like the bomb!