The fixed paternoster is a perfect leger rig for still water ledgering. Tie a 12 inch link to the main line with a four turn water knot it is a good idea to terminate this with a snap swivel which will allow you to alter the size of the feeder or the lead you wish to use.
With out the need for retying the whole rig. Tie the hook length to the remaining 6 inches of the main line with your preferred knot. It is best to start with a hook length about 3 feet long and shorten it as required if the bites are hard to hit.