The only Indian nozzels with only four holes were used in the tiny 741 and 841. Sport Scouts always had five, even when they used Scheblers. Going smaller will compromise accelleration, as the nozzel acts like a "pump".
"English brass" (high ferrous content?) floats are made in India, and weigh three times as much as original cork or "Armstrong" issues.
"Good" brass floats for Linkerts are more than "rare": it is impossible to construct one of original buoyancy from brass and solder.
I wish someone would tell me (for certain) what the tit on the idle bleed plug was for.