Originally Posted by
fietsbob
parts mixed by past owner .. its a loose ball BB square taper axle type..
You show the Adjustable cup + a lock ring.. Only show the drive side, ... from a distance ..
Bike shops will have the tools to remove it,* then you can put something of your choosing
in to replace it..
*so you don't have to buy them to use once..
..
yep.. i had to put a magnifying glass at the pic, looks like there's a lockring on the drive side too, once removed it needs a 6 notch BB tool
nope, there are definitely two notches i can see
OP, you really need to post a close up shot of that