These nuts are hard to screw and unscrew. Please give me your ideas.

I use a ring spanner. Get to the 1-2 fork nut through the diff opening.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

“These nuts are hard to screw and unscrew” as in the access to them or they are physically tight on the thread.
If they are physically tight, pull them all apart and run die nuts/taps over them.
The bolt may be difficult to remove as the end may have burred over where they tighten against the shaft. WD40 and brute force may be required to remove them.

Phil

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Find a job you love and you will never have to go to work !

As the Dr said, you need the correct ring spanners for these - Just standard quality tools.
If one did become damaged it would be due to poor workmanship. I would toss it out and use a good second hand one. No trying to clean up the thread for me.
Not something I would want to come loose for obvious reasons. I put a drop of Locktite on them.

I use a small ring spanner 1/8W for the screw. An old set of these screws I have are marked WILEY (maker) and "T" (grade) so meant to take a high tension. Even the locknuts have a grove in them for identification.

It's not fun if one comes loose. After all that work, rinse and repeat.
Been there, done that. Once......

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.