Toast all 12 bread slices until crisp and let them cool on a rack so the undersides stay dry.
Spread one side of every toast slice with mayonnaise and season the tomato slices with black pepper.
Top 4 slices with half the turkey, half the lettuce and 1 tomato slice each.
Add a second toast slice mayonnaise-side up, then layer on the remaining turkey and lettuce, 2 bacon slices and 1 tomato slice per sandwich.
Close with the last toast slices, mayonnaise-side down, and secure each sandwich with 4 sandwich picks.
Cut each club into 4 triangles through the picks and serve chilled or at room temperature.