I have a two Singer 99s, one with the lens, the other without. The one with the lens has the instruction booklet and I don't see any mention of a "springy thing". The instructions read " to remove the bulb, first remove the lens from the spotlight shade by turning the lens to disengage the lugs on the lens from the lugs on the inside of the shade and the lens will drop out". I notice that the lugs barely keep the lens in place, in fact the lens was in the accessories box. So if there is a part that holds that in better, do you have a photo? I can't find a schematic for the spotlight model only the tubular-shaped housing.