hi all... i designed and made these retainers for my and a few mates savage x due to this problem. i went with the savage bumper mounts and bolted them through the bulkhead, they never broke, here is the only picture i have as ive sold said savage now to go brushless i found the savage x bumper mounts to be pretty naff. i like your idea tho simple but effective maybe try 1.5-2.0mm thick nylon 6 and yes it looks much better than a cable tie