I've come up with a notion that might be of use. Yes, I know there are multiple ways, including AeroPack's interior anchor system; this is another idea. Comments please.
The notion is to attach nuts to the outside of the tube, then cover them up with the fins and fin fillets. These would be anchor points for a sheet metal retaining bracket or whatever else one chooses to use. There's a lot of epoxy involved in their installation, so work with a well greased bolt inserted until it's done. I'd go with a coupling nut and long bolt to ensure lots of thread engagement. And LocTite.
The notion is to attach nuts to the outside of the tube, then cover them up with the fins and fin fillets. These would be anchor points for a sheet metal retaining bracket or whatever else one chooses to use. There's a lot of epoxy involved in their installation, so work with a well greased bolt inserted until it's done. I'd go with a coupling nut and long bolt to ensure lots of thread engagement. And LocTite.
- Glass the bare tube (brown, optional)
- Attach a long coupling nut (grey)
- Apply epoxy filler (turquois)
- Attach fin (green)
- Glass from fin to tube across nut (optional)
- Apply full size epoxy fillet (pink)
- Apply final glass layer