How to modify a Sijun split type metal gearbox to improve performance for gel blaster - tutorial

[@eternalhorizons7856]

Does SHS gearset perfectly fit in that gearbox without any problem or i have to shim it all again?

[@ixclusiverc]

What mosfet is that?

[@rubbysun-lt7zl]

Seems Like Built In Tho (4.0 Gen Sijun)

[@paolobaguyo7887]

Where to buy?