You are correct the Longshot, as does the Estes Maniac, and Astrocam use the BT56, this is a close equivalent to the Centuri ST13, or the SEMROC ST13, The Id is 1.30inches, OD 1.34 Inches. Hope that helps.
You are correct the Longshot, as does the Estes Maniac, and Astrocam use the BT56, this is a close equivalent to the Centuri ST13, or the SEMROC ST13, The Id is 1.30inches, OD 1.34 Inches. Hope that helps.