Devices and methods that may be employed to detect andor prevent intraoperative full thickness penetration of anatomic walls, and to provide delineation of anatomic structures during surgery. The spring assembly includes a spring and first and second spring fittings. A demarcation ring is added to assist in the interpretation of the indicated time. The puncturing implement is penetrable into one end of the existing filters and thereby causes oil to drain out therefrom while the existing filter is attached to the existing engine such that residual oil trapped within the existing filter is substantially drained before the existing filter is removed from the engine. Fish strike indicators can include a fishing reel having a rotatable fishing line spool and housing a power source operably connected to an electrical circuit, wherein the electrical circuit includes means for closing the electrical circuit in operable connection with the rotation of the fishing line spool and means for signaling a fish strike to a user.