vertical-horizontal

I converted a vertical 3h briggs to a horizontal shaft(my first time), someone told me the I needed to plug a oil drain back plug inside the engine. I looked for it but couldnt seem to find it. CAN SOMEONE SHOW ME A PIC OF WHERE IT IS AT OR DESCRIBE LOCATION.

hello guys i dont have any more mini bikes, but i have a mini riding mower with a 5 horse flathead briggs vertical shaft this is basicly a 4 wheeled mini bike, with a clutch running upside down (hope it can handle this) running to a tranny to convert the drive positions. but in the future, can...