Hi, Mark,
It fits nicely. I just have to readjust the spacer shim. I end up with glueing 1 mm spacer shim on bottom of JM 16K spool, so i can interchange the standart Saragosa SW8000 spool and JM16K spool anytime easily wihout having to readjust the spacer shims
I think you can put stella 8000 spool or stella's replacement spool like JM, NatureBoys, SOM, Yumeya, Maxel to Saragosa SW 8000/10000.
Standart spool indeed dont have sufficient drag for GT popping, but may work for lighter fish.
Mark, are you taking part in Sanur Village Fishing Festival this 23 August in Sanur? Last year winner got 25 kg GT by popping, leaving jigging fishes behind.