RC Copper Shim Set for YS4C-53 OS4C-91 — Hatroi HA171  [HA171]

Tuning Shims for Precise Fit

Hatroi HA171 provides slender copper washers made for model maintenance and tuning sessions. These shims are useful for spacing, soft sealing, and lowering direct metal contact inside compact assemblies. The compatibility markers YS4C-53 and OS4C-91 are included as reference fit codes.

Use cases include fine-tuning clearance between mating components, adding a soft sealing layer where a malleable metal is desirable, and protecting threads and bearing surfaces from direct wear. Their small form factor makes them ideal where minute thickness changes influence handling or backlash.

Installation guidance: prepare surfaces by removing dirt or grease before placing a washer, combine washers to reach the desired thickness only when needed, and avoid overtightening which can squash copper washers. Confirm fit and function after reassembly to ensure correct spacing or sealing.

Material characteristics: copper's pliability allows slight conforming under load, often chosen for minor sealing and conductivity needs in hobby models. Keep the set flat in storage and handle with suitable small tools to avoid bending during installation.

Model Compatibility

• YS4C-53
• OS4C-91