Paypal should be fine.
If the clock arrives at your place and it is broken, I can offer you
a refund.
If you have problems with it, I can try to solve them together
with you. Would that be o.k. for you?

I created these clocks for fun and do not want to run
a "big" business with them. I do something else for living ;-).
I found a solution for my car and offer it to you as well.
Let me know if you are fine.