How do list an item with refundable surcharge on return old unit

So, I wish to sell an item, for a set 'buy it now' price, and at the same time clearly show that there is an additional cost, refunded on return of the buyers old part.

 

EG. 

it's £100, and there is a £60 refundable deposit once you send back (at buyer's cost) the old part.

 

if I list it at £160 it's extortion, but £60 how much it will probably cost to buy someone else's second hand part to repair and re-sell. 

 

I want it so show as £100, a reasonable price, and at checkout and in the  description make it clear the additional refundable surcharge.

 

 

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you can't,

 

 

that type of transaction can't be done through ebay