Take two identical long shank hooks e.g. 6/0's. Place the shanks together so that the points are opposite each other, then take a length of thin mono and bind the shanks together. Any mono will do as long as it binds the two hook shanks.
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Small joey mack I hooh the same as sandeel, through the mouth, out of the gill and nick the hook in the belly.
Larger mack I use 2 methods. Use a crochet hook to pass an elastic band through the nostrils and then tie this onto a large hook. If you have the band pretied to the hook it is really quick to pop the mack on the band and tie off the other side back to the hook. The other method is to use a gang hook. Use your normal 5/0 whatever and tie a 1/0 to the bend. Use the 1/0 just behind the mack's head to hold it on and the 5/0 to catch whatever goes for it.
You can cast a live bait but anything other than a very gentle lob will kill it when it hits the water.
If you want to get a live bait out a distance try to use the current or wind and use a float to take it out. The other way is to cast out a lead only. Tighten up your line and use a link clip to clip on the trace holding your live bait. Hold the rod as high as you can and gravity should take the bait out. This works best on deep water marks.