Despite Appearances,

The clothes pins are on the rear of this piece.

The first 3 images are of the paper template I made to pattern the drum gear saddle.
(I just make names for these parts as I go.)

I made the pattern in full originally....

Although the pattern fit rather well I found making the pieces would be easier if I made them in two parts.

Paper seen here....

Than to make the styrene piece from the pattern in one whole piece.

The plastic pieces installed....

The result appears satisfactory.