Here is 2 cents of tips:
The Daryl Turner elevation arm,
the original, is my part of choice for all my Tamiya TBU tanks, though both Impact and Schumo offer OK parts.
Important: The metal elevation arm part
does not completely address the unit's slipping issue. The metal elevation arms main function is to replaces a Tamiya plastic part that is prone to breaking after a little use.
Both the
Tamiya gun elevation unit and the turret rotation unit use the same black clutch gear and that is the part that is the "
weak link"!
Also both unit's mount platforms will "loosen up" after some wear and tear and what little positive performance either unit offers will be lost.
The good solutions for using both these Tamiya units, as advised to me several years ago by some of the Danville tanker leadership, is to wrap the motor mount with tie straps;
remove, then CA Glue the slipping black clutch gear solid and then reinstall said gear, or replace the trouble some black clutch gear with the Tamiya Solid Blue gear.
I use both methods for slipping clutch gear fixes: CA black gear gluing and or the blue gear part swap out.
Reference this part set for the blue gear source and found on ebay for a lot less money:
https://www.tamiyausa.com/product/item. ... t-id=72005" onclick="window.open(this.href);return false;
John