The serger thread I buy at Jo Ann's the cheap stuff is polyester not nylon. I have never has it melt under normal circumstances. I did have it melt when my Rowents iron when haywire and just kept heating and heating but it also scorced the heck out of my fabric.

I often use bobbins wound from cones if just doing a smaller project. But one machine does NOT like it if I use a cone --holder or jar etc. so I use bobbins--wound and used 16 one day!

i looked into buying a thread holder,but they were to costly or too cheap looking (fall over), when i was at the thift store i saw a votle candle holder that was tall and curved it is metal and works perfect for a $1.00

I had a spool holder and gave it way - too flimsy
I use a tall c.4" wide cookie can, have also used a coffee can.Find a way to have it go around your spool holder - it needs that extra tension spot to work optimally.
Someone on the Board awhile back told how to use the lower part of a large safety pin (the round loop at the base) Can't remember how she affixed the pin to the machine.

I have 2 of the cone holders for my sewing machines. One is plastic, light-weight, not my fav. The other has a metal base, very heavy and sturdy...doesn't tip over and allows me to use the cones which end up costing less per inch then the smaller spools.

I have one of the flimsy thread holders, too...I fixed it so that it doesn't tip over and not flimsy anymore.
I went into my hubby's work bench and found some metal washers...I put a few on the spindle and they fit inside the plastic thread spool. It stabilized everything...

I use a coffee mug sitting behind my machine. A very long nail driven into a piece of plywood would work also. Not as pretty as my coffee mug, though!

bend a large paperclip and tape it to the back of your machine and thread thru it. Works fine and no $$ invested

great advice, which I will take.
Thank you

They also make a small plastic clip. I have it glued to all of my machines for a thread guide. They work awesome. I glue them on with "E 6000" glue and they stay forever.