Between the Rails Uncoupler O gaugeThis uncoupler must be mounted exactly in the center of the track so firstfind the center between the rails and mark it. The uncoupler magnet shouldat no point extend above the rails by more than 3/64 inch. In mostinstances all that is necessary for proper installation is to glue it in thecenter of the roadbed. However, if it doesn't you will have to cut out asection of ties the exact width and length of the magnet. The depth of thesection that you cut out should be gauged so when the magnet is in positionit sticks up above the railtop 3/64 of an inch.The amount you will cut out of the ties will depend on which of the differentcode rails, with their various code heights, you will be using.Use white glue to anchor metal plate and magnet in roadbed. Remember,the metal plate must be placed under the magnet (not on top of it) forproper operation.