I’m starting another thread on homemade string covers.
Someone PMd me asking for info, saying photos had been removed from my old thread.
Instead of responding with a PM I'll post here so others may benefit.
Sorry if it's repetitive for some.
String covers keep dirt, dust and airborne cooking oil vapors out of your piano.
Dust particles absorb water just like a sponge.
When dust settles on your strings, tuning pins and action parts it accelerates rust and oxidation.
A string cover will keep your piano looking, sounding and working like new longer.
Also, if you have a dammpchaser a string cover helps to maintain the humidity-controlled micro-climate around the soundboard.
You can buy beautiful string covers made by company called Edward’s String Covers.
They are several hundred dollars but look much better than my home made one.
(You could build a frame for your homemade one so it looks better)
The Edward’s are made of a woven 100% real wool fabric.
It is not felt.
Felt is made from pressed wool fibers and is more dense than woven cloth.
If you hold up the fabric of an Edward’s cover you can see light through it.
You can’t see light through felt because it is denser.
I believe that felt will block out more of the finest particles, such as pollen and mold spores and cooking oil vapor, than a woven cloth that you can see light through.
Synthetic felt or poly/wool blend is cheaper and easier to get.
I prefer 100% wool felt as I suspect it may have better moisture-related properties than synthetic.
Real wool felt for my 9’2” piano was only about $85, a small investment.
Plus, Edwards using the more costly real wool leads me to believe there is a good reason.
Sure, a poly/wool blend is better than no string cover so make your own call.
Central Shippee is a company in New Jersey that sells wool felt.
Call them and they’ll mail you you one of these cards of actual samples.
You want the lighter 14 ounce felt.
They make only a couple colors in the 14-oz.
The thicker 16-oz blocks more sound, though I know a person who has it and say’s it’s fine.
When calculating how much you need measure your piano’s length.
You want to cover the tuning pins too.
It comes in rolls that are 60" wide, which is wide enough for you piano (Bosie Imperials maybe not)
Tell them you want it shipped in a roll, do not fold it.
Order a few inches extra because the angle made by your keyboard and the hinge side of the lid may be greater than 90 degrees.
If you ordered just barely enough, and assumed that angle was 90 degrees (but it wasn’t) your tuning pins on the treble side would not get covered.
Lay felt on piano and cut with scissors, but make it too big by a couple inches all around.
To prevent the felt from sagging down onto the strings I tied fishing line between the plate struts.
If there are not enough struts to lift the felt from the strings everywhere (like with my piano) you can use any small object to lift the line up from the plate.
I used a couple scraps of redwood.
Just tuck the extra felt between the plate and the rim.
If there is too much excess felt cut it off.
I left mine too big because some day I may build a frame for it.
Yes, it doesn’t look tight and pretty but I don’t care, I’m going for function.
Again, you can build a frame if you want it to look better.
I remove mine for recitals and parties and recording.
About once a month I'll carefully fold it over on top of itself, take it outside and shake the dust out.
When I do this in the sun it is amazing how much dust comes out.