I have been playing double bass for about 12 years now (I'm mainly a BG player), and my early desire to do things myself has resulted in my bass being somewhat butchered. Lately I've been getting very unhappy with it, and where i live, the two luthiers in town are both violin players, not bass players, so I've not had much confidence in them. Just recently I ran into a guy who does bass luthiery as a hobby, and what's more, he's a good bass player. I took my bass to him, and he showed me how my homemade neck repairs and my homegrown setup were inhibiting my E and G strings, and reducing my volume. So, he's resetting the neck angle, reshaping the bridge, installing a new soundpost, and one or two other minor cosmetics. I have learnt a valuable lesson; DIY should not apply to double bass repair!