For the master cylinder window,
Again took a plastic piece from an old VCR.
Cut a round piece and pasted a circle printed with the help of corel draw.
After filing made it proper round.
Placed master cylinder in summer sunshine for expansion.
Pressed it with hammer and socket.
The rubber ring expanded more than expected.
Till date no leakage or any negative effect fro the brake oil.
And yes after master cylinder cooling down, cracks emerged out after contraction, showing a real tight fit.



