When it comes to the locking saddle block falling through, the OFR has a little brass plate at the bottom of the saddle. Mine have all fallen out over time but if you notice that block has a hole drilled like half way through for the lock screw tip to fit in. Use caution and get all the tips in those holes and when you change strings loosen the blocks just enough to get the strings out and not so far as to let the block slip down. For a great product its kind of stupid that the saddle doesnt have a bottom. My 1000 series saddles have a bottom to them with a small hole. But its not big enough to let the block slip through. P.S. The 1000 series is a very good trem but its specs are different. Its advertised as the same as the OFR. Its close but if you use a caliper all the parts are a little different. And they are made from hardened steel but Korean steel isnt as good as German steel. Keep on chuggin'