... action (sneak preview): adjust_checks.png Sorry to say your tandem contains a fundamental error -- the second switch is too close to the first one. This is a common mistake. There isn't room for the second switch blade to open behind the first switch rail. The prototype switch opening is 4.1/4" to ensure an adequate flange clearance (2" min) all along behind the open blade. You have only allowed about a rail width (2.3/4 ") of space for the blade to open: howard_tandem.png It is also necessary to have room for the stretcher bar brackets. As a rough guide, you need a minimum of 10" between the running edges of the first switch at the toe of the second switch. regards, Martin. posted: 7 May 2008 03:23 from: JFS Martin, Many thanks for the reply. I like the proposed dialogue boxes- I expect that you are well prepared for the pressure you will now come under to release... Does this proposal allow you have one flare ...