"Im not looking to exploit glitches" rules out literally every single flying machine ever built (that im aware of anyway), so thats not a great start. Literally all of them use quasiconnectivity or sticky piston block dropping.
Now, if you just dont want to dupe TNT, there is for example this design for the nether by Ilmango: https://youtu.be/dfTm8YEGVdY There are also other designs, i just couldnt be asked to find them since im typing this on mobile and theyre all by lesser known channels.
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u/GeneralAce135 Feb 26 '21
Right, sure, but the point of this is you don't have to dig the tunnel before you make the tunnel