Take the borrowed tool back with a thank you present.
I have "lost" two fishing books loaned to a work colleague who left while I was on holiday. GRRRR.
Dave...I still have a Colourtune tucked away in a drawer in the garage. Unopened for many years. I also nearly bought an SPQR tappet adjuster too but held off.
I have both, the Colourtune is of use on my vintage Sunbeam, the SPQR has not been used in 20 years.
One of the offshore crane drivers did an extra week for his back to back to be paid back later. During his 2 weeks off the "borrower' was sacked & the company would not pay for the extra week as it was a private arrangement.
Tim