Originally Posted by chippy

For the pulleys just use CA (superglue)
For brake pads use a contact adhesive or i have used automotive silicone any thing that can handle a bit of heat.
The diff you are referring to is a multi diff It can be a one-way diff with out the pins ,only has drive when accelerating , both front wheels free wheel independently Off power braking is a lot harder need to brake in a straight line.
Pins inserted becomes a solid diff both wheels turn the same speed as other on and off power