The runners are notched on the inside edge to allow the outside lip of the hatch to slide. The ones I've messed with were attached with stainless screws/bolts.
It's a lot easier if your boat doesn't have the faux lambswool headliner in the cuddy.
Where are you at? I might have some out in the shed.
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD
1979 Marine Trader 44, twin Ford Lehman 120s
2006 Panga 14, Tohatsu 20
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