This is a great tool for repairs and for making tape loops. It takes a bit of practice and you have to have the blades set correctly but it works really well. :
An Intro to Analog Tape Splicing & Editing | Tape Op Magazine | Longform candid interviews with music producers and audio engineers covering mixing, mastering, recording and music production.
GIUNTO NASTRO CASSETTA bavaglino vintage EUR 11,33 - PicClick IT
Vintage Bib Video Tape Splicer/Nortronics Splicer and Dispenser Cassette Tape... | eBay
Retrorocket - Bib recording tape splicer, made in England. This is for open reel tapes not audio tapes (thanks to Edward J for pointing this out x). Missing felt on base &
How to Fix Cassette Tapes The Right Way. Open, Splice, Repair Like a Pro. - YouTube