Here's the response I sent him:
Old School: You could always cut two slits in the body tube (about 3/4" from the top, or under where the base of the nose cone shoulder will be) and lace the shock cord through the two slits.
Check Step 4 of the old Wac Corporal instructions: HERE
When I first saw this back in 1969, I didn't like this method. It was unsightly and thought it might tear from a hard ejection. Notice the end of the shock cord (facing up) has no knot. Estes went back and forth - knotted, not knotted.
The old Estes Tri-Fold "Tea Bag" mount will work in small tubes, but you have to make it real flat: HERE
When this was first introduced, the shock cord was glued down on the first, top section then folded and glued in all of the three sections. Now in the Estes instructions have you start the cord in the second section. The (empty) top section is folded over the cord on the second, then both sections one and two are glued onto section three.
This Centuri design had great promise, but they never stayed stuck inside the body tube! You always had to go back inside and press it back down before a launch! It was a pressure sensitive, metallic card stock with gauze threads for reinforcement.
The old MPC style of mount (Harry Stine design) is flatter than the Estes style: HERE
It resembles the Centuri style, except except the MPC mount was light card stock. You glued this one in the body tube.
I've also gone back under the engine block with a sharp awl (looks like an ice pick) from the rear and raised one side of a glued in block to tie on Kevlar. The Kevlar was knotted, then laced under the block.
Glue was placed under the raised area of the block, then the raised area was pressed back in place into the glue, locking the new Kevlar in place.
Here's some ideas from the Apogee Peak Of Flight: HERE Check page 6.
So Mr. Hamblin, you've got some homework!
Something here should help out.
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