John, there was a good description of mast lowering by Royce Whatchorn in the old forum but I can't remember exactly where it is.
He has to lower his mast (part way) everytime he goes sailing on his 27 (so not much different to your 275. He does use rather more than the spinnaker pole so it might be too elaborate for you.
I'm sure I've kept the file somewhere in my computer so if you can't find it online just let me know and I'll dig it out and e-mail it to you.
Chris.