Depends on the opening size in the bottom of your spin feeder. All Seasons sells a short or long downspout funnel that will cover a 4" size hole and funnel it down to 2" opening. Then all you have to do is bolt one of their or other control units to the bottom of the feeder over the short/long downspout.
Here is a sight that sell all kind of parts to build your own spin feeder and you can order online from them. Find a local All Seasons dealer and should be able to get any of these also. https://shop.mummesinc.com/departments/feeder-parts