I will probably repost this on my King Tiger Build Thread - but I thought a lot of tankers using the DB2/3 system might be interested in this (if it hasn't already been done).

WHAT IT IS: It's pretty simple; by using my Spectrum TX I was able to MIX in ACC2 and slave it to the throttle. I removed the cam operated motor that controls the elevation and built a cannon barrel mount to the floor of the turret. With the barrel re-positioned, I added a servo that was connected back to ACC2.

For me, this has been the most hated part of the Heng Long system and hence the DB2/3 system. The cam operated elevation always upset me. Plus, I was able to extend the up and down position of the elevation for those pesky Shermans that hide up on the hill.

Here's some pictures: