Yes the reason you dont want to weld is it will deform the tank at the open flange area.
They are like a normal rivnut without the top flange.
Instead of the flange it flares at the top, when you drill the hole you use a counter sink tool.
The small counter sink is for the rivnut to sit in ,then install as per normal.
Go buy a few and play with them, they are a peice of cake.
The other way I used to do it is make an alloy plate that looks like a picture frame around 20mm wide by 5mm thick, the inside of the frame is the same as the inside of the tank access hole.
The plate has the m5 threads and the tank has 6mm holes at the same hole positions.
You slip the plate in side ways into the tank then put a few counter sunk pop rivits in the tank from the top and into the plate to hold it so when you take the screws out the plate wont fall into the tank.
This can only be done with a square or rectangle cover plate not a round.
Jim
They are like a normal rivnut without the top flange.
Instead of the flange it flares at the top, when you drill the hole you use a counter sink tool.
The small counter sink is for the rivnut to sit in ,then install as per normal.
Go buy a few and play with them, they are a peice of cake.
The other way I used to do it is make an alloy plate that looks like a picture frame around 20mm wide by 5mm thick, the inside of the frame is the same as the inside of the tank access hole.
The plate has the m5 threads and the tank has 6mm holes at the same hole positions.
You slip the plate in side ways into the tank then put a few counter sunk pop rivits in the tank from the top and into the plate to hold it so when you take the screws out the plate wont fall into the tank.
This can only be done with a square or rectangle cover plate not a round.
Jim
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