I helped a friend out with his 30B (dead spots and hots spots), and in the process noticed circuit breakers inside that I do not recognize. Are any of you familiar with them? Did Gilbert use them or must they be aftermarket units installed by someone else later? I've always seen the bi-metalic points type. They are nicely held in place by clearly purpose-built brackets. I think I found the breaker on the internet - click here. But what about those brackets? Do you have any input, observations, experience with, or advice on these to share? Thanks.