Guest is absolutely right. Here are some similar reels, all of which I think may be Terrys. The
red arrows in the pictures indicate threaded holes for the headcap screws. Some of the other visible holes in the headplates are threaded, some are not.
Reel 1 is a tiny thing with a half-crank. There is no brake spring for the pivoting lever to operate, but it may have been attached at the 10:00 o'clock screw hole, with a pin that went through the large hole at 3:00 o'clock. The important thing is that the lever is attached to a post.
Reel 2 has a brake spring attached using a hole near the edge, while the brake pin goes through another hole above the pinion. The push/pull operating lever has a notch that engages the notch just at the left end of the spring to keep the lever and spring latched together. The lever enters the space through a round hole, not an open slot, on the edge of the headcap, so you can't remove the headcap without sticking a screwdriver in there to separate the lever and spring notches. Superb engineering!
Reel 3 has a rotating click, which is attached only to the inside of the headcap, not the headplate. Nevertheless, the headplate has a couple of extra holes in it.
Many reels of this vintage (roughly 1875-1885, as judged by the A&I logo on Merv's reel) had extra holes in headplates, possibly to facilitate adding brakes and clicks as requested by buyers. It's conceivable that the posts in Merv's reel were added simply to plug unused holes. It's also conceivable that some apprentice couldn't decide where to put a post for a pivoting lever. Who knows?[/code]