yea thats generally how you saw off bolts ..

your top adjustable race will do , since the lock nut has a shoulder You cannot use it.


measure thrice cut once , since it won't grow Back ..

common fork/headset thread is... 1 inch x 24tpi. which I presume is what you have

ID and so quill stem is 7/8" or 22.2mm..

( a .833" is another cruiser - Kids bike stem size... which uses different parts )