eezibleed cap from old filler cap .. what drill bit size?

[xpress]

hi there, i am going to drill a hole in an old master cylinder filler cap, i have a few different drill bits, what drill bit size would you recommend i use?

i haven't measured the tube yet, i guess i can check from another hole in another eezibleed cap, and use the little hexagon tightening bolt and make one up. do you recommend i use some silicon sealant on the inside of the filler cap to make sure no air and fluid can escape?

also, looking on an old eezibleed insert, a piece of paper in an old eezibleed box, it seems you can get the lockheed mini filler cap eezibleed cap as an option, anyone know if gunsons are still making these available?

many thanks.

[les]

You got it, just copy the holes in the other caps!!