Pic 1. RDM Plastic 2 part Collar (replaced Ring and Pin. See Radz or Goya for that type)

Pic 2. RDM Push Pin Collar (current type but fits all RDM extensions)

Pic 3. SDM hinged Collar

Pic 4. SDM Push Pin Collar (current type but fits all SDM extensions)

Pic 5. RDM Top Cap

Pic 6. SDM Top Cap

Pic 7. SDM Euro Pin Base assembly with fitting pins

Pic 8. SDM US Push-Pin Base assembly