I wanted to order a few copper crush washers for the oil pickup screen on my Lycoming sump. I got what they told me was the replacement part for what I had. The part number is MS35769-21. the -21 denotes the inside diameter of 1" which is correct. But my oil screen pickup has a hard flat copper washer on it. The part they sent me is a round copper case with fiber material in it. It's meant to be crushed but is that ok to use on the pickup screen? I'm hoping someone has experience with this.