Like the real Challenger, turret rotation gear is installed on the top of hull, and gear box is in turret.
To modify turret lower hull
as the pictures shown below,
Check interference between turret and hull
Assembly turret floor
Prepare turret rotation gear parts, clean the edge and tap screw hole.
Remove plastic shaft and make a hole of 4~5mm in diameter,
Push bearing into whit plastic ring and than fit it to hub with cement,
Twin-Motor gear box: each track is driven by one motor for maximum output
Trim plastic shaft till A part of B001 can be fitted into right position
Fit assembled B001 into B002, be award with direction of B002
Fit assembled B001 and B002 into road wheel part
Glue B002 with road wheel by model cement and B001 A part with plastic shaft with quick cement,
Remove hub of road wheel part 2
Fit small rubber tube to shaft and than glue two road wheel parts as the TAMIYA assembly guide.
The hole on middle of right spare track holder is power switch, charge connector is covered by left spare track.