After t' loss o' engine hook, ya bilge rat, I friction fit t' engine into mount. Avast, me proud beauty! ejection charge blew out two sides o' rocket body around t' engine. lesson learned; when puttin' in a scratch D engine mount, me bucko, use a HD 20-50 centerin' rin' as a thrust rin' and reinforce t' engine hook with a HD 50-55 centerin' rin' or two. Begad! T' repeated thrust/ejection cycles weakened t' body tube holdin' t' engine hook.