I assume you mean motor post protectors if you cant get the ferrules from chas ,charlie or ABS or dave harvey ,what i have done in the past is to cut to length a suitable diametre brass tube and use some if that
It works just as well
Not sure if they will suit you but you can buy string ferrules for electric guitars. Genererally Fender Telecasters have them they are fitted in the body and are 6mm id, here's a website you can get them from. http://www.axetec.co.uk/guitar_parts_uk_015.htm. You can also get them from Ebay, hope this is of help
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