Hey Guys I Just Found A Method Alot Of People Around Lincoln, Nebraska Are Using. The Watch Crystal Is An Excellant Idea, They use "PERMATEX" "Brand Spray Adhesive PART # 82099" This Info Comes Straight From Permatex Corporation. I Had A Buddy At O'Reilly Auto Parts Call Them Up And They Said The Brake Fluid Will Not Degrade This Sealing Spray At All. They Recomend Getting A Piece Of Watch Crystal The Same Size As The Opening In The Cylinder And Putting An O-Ring The Same Size As Cylinder Opening. Scuff Area With Emory Cloth Or Suitable Abrasive Material For Good Adhesion Of Spray Sealer, Then Clean Area Well With Paint reducer Or Mineral Spirit Making Sure To Not Get Any Inside The Cylinder, Put O-Ring In First, Then Put Watch Crystal In On Top Of O-Ring, Then Put Tape On The Top Of Crystal, But Only In The Center Where You Don't Want The Spray Sealer To Cover Crystal (So You Can See Your Fluid Level) (Leave A Tab Of Sorts Of Tape On Top For Easy Tape Removal) Then Spray PERMATEX Sealer Over Inside Edges Of Crystal And Cylinder Opening. Don't Know If You Can Put On 2 Or 3 Coats Or Not, I Would Think So. A Little Pressure On Crystal To Seat Against O-Ring While Drying Would Probably Be A Good Idea For Optimum Sealing. I Hope This Helps, I Just Rebuilt The Clutch Cylinder To Find That The Sight Glass Had A Hole In It And A New Cylinder Would Cost $90 Some Dollars. I'm Going To Try And Find Some Watch Crystals The Right Size And Give This A Go Monday. I'll Keep You All Informed. Does Anybody Know Where A Good Place To Buy Watch Crystals Would Be?? Thanx!!