Isn't that bridge a replacement for an angled tune-o-matic? If so, it wouldn't work as a replacement for the harmonica bridge.
I bought it "on speculation", but it does fit perfectly, pics when I get a chance. Quality isn't great, but then, wasn't so great on the original harmonica bridge either.
Graphite powder in the nut slots, or a whole new graphite nut would probably help. Maybe locking tuners too, but I wouldn't think those would be necessary as long as you use it as a "wiggle stick" and not an Uli Roth divebomber.
Yeah, Bigsbys don't dive bomb so well and if you try, they never come back the same. What I wish I could get rid of is the "wiggle" where the vibrato arm attaches to the tremolo - I might just remove that upper spring and replace it wish some washers - makes for a very uneven vibrato as the spring takes up some of the motion intended for the bridge.