well mutt,
the spider is attached to the arm and its for those 44 tooth sprocket rings,
he wants to put a regular small sprocket,
but the spider is unremovable,
and the arm has no hole to secure the sprocket,
so I came up with this ideia of using a part of the spider to secure the sprocket.
It may not look to good but I think it can solve the problem.
what do you think?