Shaft extenders for 1950s MacGregors rocket shaft etc

Equipment
1

Does anybody know what size shaft extenders I would need to extend numerous MacGregor irons I have.

I play with Haig Ultradyne II irons.

All my 1950s macgregors feel great but the shafts are so short. The long irons feel great but 5-PW feel so short and upright.

Any links would be greatly appreciated.

2

I’m 6’0 for reference.

3

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Will these work?

4

I extended some 1950s rocket shafts a few years ago. I believe .580 was the correct size.

Remove the grips and measure to be sure. I’d hate to mislead you based on my memory.

I bet Mike would know off the top of his head.

5

I’ve never done this before. Aren’t the extensions severely tapered so that they will slide into any shaft regardless?

Thanks for the response.

6

No, you have to get the correct size. A .600 extension won’t fit into a .580 shaft, for example.

Outside of that, they’re very easy to work with.