Gday 

Anyone no if the front master cylinder has 2 holes in the resovoir for flow and return , i have seen later ones with 2 holes. This one shows 2 looking from the top but one isnt visilbe when you look through the bore.

 the other  hole is very small . you have to use a torch light down the bore , or a small jet drill if blocked,   a good hone & clean 

 Thanks Daddyracer

Do you know the diameter of the hole mate??

 can't remember but it is very small even when clean it's hard to see with a torch, i used a idle  jet drill somewere around  0.020" thou