20 Most Recent ACE R Broadcast Spreader - Set of 2 Questions & Answers

Get a cable for a bicycle brake set and change it to that.

At the bottom of the spreader hopper is a gate, there should be a setting lock that allows the opening to move only so far. This may be at the handle controls but unlikely.
To be sure of your spreader pattern and rate, use the spreader on a parking lot to see the pattern, you can always sweep up the granules and reuse them! Walking speed is the biggest factor in spreading rates.... Opening is the next....

It is not a well known make, so you will have to use a part from another make or send the spring to a spring maker company for replacement. https://www.google.com/search?q=ACE+2139582+miter+saw+parts ..

Sounds like the switch under the engage handle is bad.

Check for grass build up in the deck. You may have a bad bearing in the idler pulley or the blade hubs. bearings are likely seizing up. Sometimes it's due to the deck being set to low.

Fill with one gallon of water and recommended amount of herbicide, screw top in tightly and pump it up as high as you can with air pressure.