Working on a NOS Tillotson KC16A (same design as KC15A and other KC's and KA's). The idle tube on these carbs are secured into the body from the factory with a hard reddish sealant on the threads. To remove the tube the red sealant refuses to budge with a good fit and grip/twist with a slotted screw driver. Any tips out there what can be used to help soften the red sealant ? It is not an anaerobic type.

Reason: the idle tube correctly touches the front of the high speed main nozzle but is off centered to the right a bit in the main nozzle and needs to be corrected. A factory flaw that was missed.

Thanks