Tibbe key conundrum

I have over the past decade replaced too many broken door handles & swapped out the Tibbe key tumbler discs. But trying to rebuild a set of tumbler discs from scratch is proving impossible. I’ve read the key code, assembled the disc and space stack, loaded them into the lock cylinder but it will not take the key. I suspect a clue to the problem is despite the discs and spacers fitting into the cylinder the side cut codes on the discs’ do no show in the viewing port in the cylinder. Do the discs come in Right and Left configurations?

This thread seems to have most of the info Jon

Thanks for the suggestion but the bulletin does not seem to help. My spare discs fit in the cylinder but the side notches do not show at the viewing port & the key will not slide in when the cylinder is in place in the handle casting. John Meade

Jon,

According to TSB 76-64 the door lock repair kits are handed LH and RH

"