Remixed the rack from the original to work as a linear actuator for a bruder bulldozer. its a little big but works great. cheap 5 dollar 360 servo was able to lift 5 lbs without a struggle.

props to the original

https://www.thingiverse.com/thing:2852688

Video testing the lift power with a 5.50 metal gear continuous rotation servo. plenty of torque and power this weight was no where near what it could handle. the weight is a 250lb pull magnet from harbor freight (around 5lbs)

https://youtu.be/rDVIay_Hf_w