I just received my Turbelle stream kit (6000) and was attempting to mount it to my AGA 75, using the supplied mounting brackets. The diagram for attachments to aquariums with frames indicates that a long stainless steel screw is to go thru both clamp pieces, with a plastic screw going thru the bottom hole of the inside clamp piece as a spacer. The problem is that the inside clamp piece does not have an upper hole for the stainless steel screw to attach to and the bottom hole is not taped for screw threads. Was this piece made wrong or am I missing something?