Thank's for the kind comments guys and a special "thank you" to Sal for starting so many of us on the double dog road.
Sal, the hinge pin was made from a brass wood screw in the drill press using medium and fine files.
One end was reduced in diameter in order to fit through the bridge and be peened (riveted) to secure.
The spring location pin was from a 3/32" dia (0.093in) stainless steel welding rod and had both ends slightly tapered,one to ease fitting the spring and the other to assist in fitting to the bridge (drive fit.) I formed a small groove on the pin in the drill press using a three square (triangular) needle file to help secure the spring on assembly.
The dogs were made from off cuts of 2mm, 316 stainless steel by drilling and using a 15-500 dog as a template. They were cut using a hacksaw and filed to shape.
One dog had a fine stainless steel pin (fish hook shank) fitted in order to retain the spring as the spring location groove was removed when Dremmeling the side plate.
A special dog having a 90 degree spring location hook would also suffice.
Lee, I found the small springs very difficult to handle and tethered them by passing a length of braid through the spring and forming a loop. They were easier to handle/find this way. Believe me they are even worse to handle than the 14-99's
Re the pin. It's 1/16"dia,drilled through the dog and pressed it in,fiddly!.
Bryan, I am not familiar with the ProGear reels but I am sure you could carry out a similar mod on them.
I think it is important that the second dog hinge pin should be positioned exactly opposite the existing one on the bridge ie in the "opposite hand" position or where it would be on a left hand reel.
The spring location pin position can then be established with the new dog in position.