Chuck340, I haven't installed the Arctic Circle cooler yet. I was waiting to receive the plastic retainer before I went further with it. My present Aavid cooler has a retainer plate with a notch, so it has never been without retaining clips. But in any case, I would have used the string method before I relied on friction.
By the way, I don't need the Arctic circle for 550E @733 MHz. It stays around 45 C at full bore. Can't overclock higher than 770 (140 FSB) anyway, I think because of memory limitation. It won't POST. Higher VCore is no help. So, unless and until I lay my hands on some 2-2-2 PC-133 to go higher, I think the Arctic Circle is only for long CPU life and good looks. I can get a faster CPU for not much more than the memory, so that upgrade may never happen.