The wheel on the idler arm helps keep the material against the drum. Below is a table and schematic showing all the parts that make up the Idler Arm Assembly.
| PART # | Description | Qty. |
| 185P-A401075 | Wheel Complete Assembly | 1 |
| 185P-M001260 | Idler wheel Pin | 1 |
| 185P-P001632 | 8-32 x ΒΌ SS Socket Set Screw | 1 |
| 185P-P005320 | 8-32 x 5/16 SS Socket Head Cap Screw | 2 |
| 185P-P009550 | HD+ Idler Arm Flanged Bushing | 1 |
| 185P-M001480 | HD+ Pivot Arm | 1 |
| 185P-M001486 | Pivot Bracket | 1 |
| 185P-M001494 | Modified Set Screw | 1 |
| 185P-P001160 | Snap Ring | 1 |