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Trying to add attachments of appropriate size and type, they sometimes won't attach, causing the post to duplicate. Frustrating.

Here is the RPS seat. The wooden core under the foam was pretty rotten, but served as a new plywood template and the foam was in excellent condition (the foam is the most expensive and difficult portion to replace when redoing upholstery.) 30 oz marine vinyl was inexpensive at $18 per yard locally in High Point and can be sourced even cheaper from the internet if you know what to look for.

I have three industrial sewing machines, each have a specific area of expertise. If you want to do upholstery, look for an old Singer 111-155 which has a walking foot mechanism that doesn't pull on the vinyl. They are available without reverse for $300 to $800 depending on condition and whether they have reverse and a servo or a clutch motor. The clutch motor is much harder to learn to use. Usually it isn't the vinyl that wears out first, it is the stitching especially if V92 or lighter thread is used and the thread is exposed to a high UV environment. I used V138 thread, but for really long lasting performance, PTEF thread can be used which is essentially resistant to UV. This is an aspect of restoration that anyone can become proficient in just by watching YouTube videos.