You'll have to have a new longer spike first. The spike comes mounted in a
standard tapered wood plug.
You'll have to remove the strings, bridge, and tail piece. Once this is
removed, you can just pull out the existing spike with its wood plug and
replace it with the new one. Installation is reverse of removal but with
lots of caveats:
1. The new tapered wood plug might not fit in the existing hole. You need
to ream it with a special tapered tool.
2. The sound post might fall off and need to be set properly.
3. Bridge position must be set properly.
Unless you have the tools and strong inclination to learn the trade, I would
pay a violin shop to do the work.
The endpin is held in by the tailpiece. Loosen the strings, and the
black (?) hoop around the endpin assembly will loosen. That's tapered
into the bottom of the cello, you can loosen that by gripping it
firmly and rotating it to loosen from the cello. Once you have that
in your hand, you'll see which of the several possible ways of
putting the pin into the wooden piece have been used.
When I replaced mine, I used a piece of bar stock, sharpened the end,
and on the top I threaded it & secured a shoulder nut at the top with
some loctite. What's wrong with the current one, too short maybe?
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