Building a fiberglass kit with a 38 mm airframe and a 29 mm motor mount. The estes ones I have are just too big. Looking for something like an areopack retainer. A new one is 20 ish, if anyone had a used one they would part with for less then that I would be very grateful. I pay shipping. PM me. Or if you know who else makes quality retainers that I could purchase. Thank you!