Re: Issues with Grubee GT2 Frame
Actually I thought we were talking about both.
Filing on the locking edges is a way to fix the tight fitting gas cap, or as I did, just try another gas cap (I have about five spares of the funky little 1.5 liter gas tanks with caps so I can easily juggle gas caps).
You also asked about thread size of the petcock. I checked my spare GT2 frame (build in progress so no petcock has been fit yet) and the thread size is 1/8" NPT.