Twenty four (24) HO scale "top shelves" for Sergent Engineering SBE couplers. These parts can be used to add the top shelf to Sergent Engineering "bottom shelf" SBE couplers to make "double shelf" or SE couplers. SE couplers were previously available through Sergent Engineering but trouble with the 3D printer has prevented these couplers from being restocked.
To install, trim one of the parts from the sprue and attach it using a small amount of CA glue to the top of the coupler. Trim/sand/file off any remainder of the sprue. Paint to match the coupler. There are enough parts to convert 24 SBE couplers, or 12 railcars worth of couplers.