| I have an almost identical bass to this one and I can't say that I have had the bridge slip once. The string pressure should keep the floating bridge in place... obviously that's not happening here as you are posting this question...
Why not consider some double sided tape to help the strings downward pressure hold it in place?
Fishheadjoe
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Yamaha Bass club member 157 - BB1100s, BB605, Aria owner, Yorkville/Traynor member 62, Roscoe LG3000, Pedulla Rapture
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