jarndice

My answer is to use the Aerial stowage channel from a HENG LONG PZ 3 or 4,
Cut the channel into four equal parts and superglue One piece of channel on the inside of the Tank Hull immediately behind the Gearbox and glue another piece of channel exactly opposite,
Cut a section of 3mm Plasticard to size and it will slide into place between the channels,
And you still have a spare pair of channels to make a second Firewall,
This works on every Tank I have ever built. It also adds stiffness to the Hull.
Heng Long sells accessory packs containing amongst other items spare Aerial stowage channel for just a few $$/££.
Shaun.