Hello George, I am a new member here and cannot PM you yet. However I have been using a friends AP-2 for some time and now looking to purchase or build one for myself. I am working on a very stiff and high mass aluminium rack system and have found the AP-2 / ACH-01 to be an invaluable tool. Will try to add some more posts on here and hopefully persuade the moderators that I am legitimate. Anyone can see that if you check my on Pink Fish Media - Freddiekaberman.