Hi Jim

Just looked at my Remington Nº 5 streamlined portable and yes, your bell arm is bent. It looks like the chamfered  pin on the bell arm should be sitting perfectly vertical and the pin on the margin stop should contact the chamfer about 1/3 the way up the chamfer on carriage return.

When the bell is activated, the bell arm should swing horizontally while being pushed by the margin stop, then release as the pin passes the 'ding' point. On carriage return. the margin rail should lift vertically over the bell pin as the margin stop pin rides up and over the bell arm pin. Hope this makes sense,

Sky