it will be sufficient to plug it on kernal+basic ROM socket and it will work without piercing the case and WITHOUT EXTRA WIRES!
How to handle switching between kernals?
The C64C will boot-up with standard kernal (I prefer always that on standard boot-up the machine seem not modified....)
and for swapping the kernal a RESET has to be performed, Hardware or Software!
Hardware: lowering the /RES line (example: pressing the RESET button on an external card...)
Software: typing "SYS64738"(+"RETURN").
NOTE: the price includes the $ 8 that will be paid as a copyright at the conclusion of the sale.
This mod will be assembled on request.
22€ (8$ royalty fees included) + eventual Paypal fees + shipping cost