stinkfist

Working on an early 90's amplifier with some damaged trimmers. Everything is working now but two of the shafts/knob assemblies are damaged and I have not been able to locate a replacement part. Please help. The short one sits inside two trimmers and is 3/4" long. The long one sits inside 4 trimmers and is 1 3/16" long. I appreaciate any help or suggestions. Thanks.