Just tried a L Shift, Enter, & 7u spacebar key from the MT3 BoW ABS set on my Frog 8k which has TX AP (rev.4) stabs on it & they worked just fine. The only thing I can think of is the MT3 caps do fit a little loose on the stabs cruciform mount & can teeter totter. Although that can be easily fixed by putting a small piece of plastic baggie or cello tape over the mounts on the stabs. That effectively shims them to the correct size & keeps them held tightly in the caps's mount.
