So hand them cash?
I put everydamnthing on my card and wouldn't care if it took a while to come back, but our card processor at work takes up to a full week to process a refund. More than 1 customer has gotten all worked up that it took forever... and that's not us sitting on your money for any gain of our own... it batches out the night we refund it and is gone, the rest of the wait is the processor. I've told people if it's a debit card and will be tying up actual money for them, do a split and pay cash for the rental (or core charge), then get cash back.
Or just go buy one from HF... how many times you planning on doing this? TBH I've used one of theirs professionally before, several times, and not broken it. Just get some real bolts in whatever size you want, the ones in the box are garbage. I sheared the heads right off bolts with the rental at work pulling the flywheel off my mower engine.