Decided how to configure my CF Mongoose 54, and started the NC tracking sled. I'm going with using the electronics bay as the anchor point for motor retention, tower launch, DD via cable cutter out of the payload section, RRC3 with Eggtimer Quark backup (both on Magnetic switches), and Eggfinder and antenna in the NC. I'm trying to make as much as possible mechanical attachment, so there will be a few 4-40 set screws used. I'm doing it this way because every commercial case except the Loki 54-4000 will fit in the stock booster, and for that one exception I can add an extra 12" piece of CF airframe to the booster using the motor case as the coupler and it will be held in place by the internal motor retaining rod running to the electronics bay (basically a CF tube sandwich held together by the aft retainer and the vent band). Only thing I really haven't decided is if I will tip-2-tip the fins. I don't want to overbuild this one...I want every scrap of performance I can get from it.
Ordered some SS, long shank eye bolts. I wish I hadn't standardized around M6 eye bolts a couple years ago (my tracking sleds threads onto the shank for retention). They were cheap then, but now I can't find a supplier that meets the desired shank length (yes I checked ebay, McMaster, Grainger, Fastenal, and myriad domestic boat and rigging companies), so I had to order them from the UK. I ordered 10, so I could justify the shipping.
I guess I shouldn't complain about a $4 eyebolt when it is vital for the successful recovery of a combined $500+ rocket, electronics, recovery gear, motor case, etc.