Hi Everyone. My first posting. And what a dull one it is. I'm based in London. A while ago I bought a Mark I head from a very well-connected friend (former guitar tech with probably the most famous rock band in the world). The head is apparently unusual in that it has no reverb or graphic EQ, and, according to my friend, was built as part of a matched pair for one of the guys from a band called Foreigner - from whom he bought both. The head was fitted into a rack-mount unit but I was also given the original casing. Since my studio is increasingly free of rack mounted gear I've been trying to fit it back into the case, but am having problems finding four correct corner screws to hold it in place. They certainly aren't metric, like we have over here, but can anyone tell exactly what I need to be looking for? I guess the amp would be dated late 1970s? Again, sorry for the most boring debut post in history of this forum! Terry in London.