What the thread found

• Delrin discs were historically supplied by one manufacturer but are no longer in stock there
• McMaster Carr stocks various delrin and nylon washers that can serve as substitutes
• IGUS manufactures self-lubricating plastic bearing components and offers a large selection of washer stock items
• Thrust washers with a 5/8 inch bore diameter function effectively as replacement discs for arm posts
• Thrust bearings provide smooth operation similar to the original delrin discs

Depends on

• The original manufacturer and specific part numbers are no longer available
• No confirmation that McMaster Carr or IGUS items are exact matches without measurement verification
• Discussion references specific arm models like the 3A but suitability for other equipment is unclear
• Some suggestions mention proprietary products whose exact suitability is not detailed

Parts

Arm Post

Same gear or parts

1. 2026Rocket Arm (elastic band arm) versus traditional spring arms like the G70x: performance, weight, build, and design dispute.DisputedFacebookThe Steadicam Group
2. 2026Vest drops: what lowering the arm socket actually buys, and what it costs at the topOperator practice
3. 2026Recommended upgrade priorities for a GPI Pro steadicam rigSteadi-Newbies
4. 2025Differences between M-1 and M-2 gimbal designsGeneral Discussion