How to remove saw blade on a deWalt radial arm saw dw8001?

I have just set up my late fathers radial arm saw in my workshop , I cant ever remember seeing the blade been changed. I know it isnt rocket science ! lol

Having just changed the blade on my table saw , which was kind of the same dilemma Im facing now , which is how to stop the blade or shaft from moving whilst I undo the nut that hold the blade on ??? The table saw had a hole on top which you put a rod into to stop the shaft !

The only thing I can think of for the radial arm saw is that the shaft on the otherside of the motor has a threaded hole on it ? as if something might screw into it , maybe to hold it in place whilst changing the blade ? or maybe not , it may have a completely different use.

So I would be grateful for any advice or ways in which I might best secure the blade/motor shaft whilst I undo the nut holding the blade on ????

Thanks in advance

blkhawk5 years ago