Definately DIY. Each H16 skipper seems to have their own favorite method. Some use a single line tied to the dolphin striker, deployed to either side as required for righting. Some use a line tied to the rear port pylon, around the front pylons then tied to the starboard rear pylon, excess slack can be taken up by a bungee cord with blocks (Hawaiian system). Some use the superbungee (Easy Rite).

I use an old jib sheet, cut to proper length (crew should be at about 45 deg. to the water when you try to right) and tied to the rear pylons via the front pylons. I leave off the bungee and blocks from the Hawaiian system and just tie the righting line up under the tramp. Looks like an M shape if viewed from above. I have found the superbungee type to be too long when deployed.