Ryobi Fixed Line String Trimmer Head

I have the Ryobi ELT1100A 1100W electric trimmer which I hated the bumpfeed head it came with and wanted to replace it with a fixed line head.
There are few fixed line replacement heads on the market but I thought I'd make my own.

I used the MTM 3.1mm Pre-Cut 35cm Trimmer Line from https://www.edisons.com.au/orange-35cm-100-pcs-pre-cut-square-edge-trimmer-line/
The head can be used with smaller square or round lines.
When mounted the 35cm line is ideal length for this head.

Initial prot