Arrieta 578

[Kevin McCormack]

Originally Posted by Bob Jurewicz

Troy,
Dean Romig, a Life Member here, sell a neat little "plastic" tool that slips between the end of the forend and the underside of the barrel. It gently nudges the forend free. Dean's is great but you could of urgency make one from a thin piece of wood etc.
If this process does not work on your 578 then the release plunger in the forend needs adjusting.
Bob Jurewicz

A "bone folder", essentially a plastic letter opener type tool used for smoothing and rounding leather, is basically identical, and can usually had at well equipped craft stores.

[Bill Murphy]

A wedge type of tool could do some serious damage if the problem is in the latch mechanism. The wedge is used when the latch is disengaged.