Take the time and effort to either remove and replace the bleeder screws or find cylinders with good ones.

I have found very few screws and bolts that were truly stuck.. I've removed dozens and dozens of stubborn fasteners by various methods, and only a few have had to be drilled and re-tapped.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-