Hi kristyo
Don't forget to check out your local library as many of them subscribe to Ancestry Library Edition, and apart from family trees, all the datasets are there. Libraries usually offer 1-2 hours free access at a time.
The entry you found online is for the probate calendar, not the actual will. If you are in Australia (it's only a guess as you haven't updated your profile yet) you might have a problem obtaining a copy as the Probate Registry only accepts cheques drawn in sterling or cash at the counter in Holborn, London. As he left a sum of money, it might be worth you trying to get a copy if you can think of a work around.
Here's the corresponding entry in the death index
Deaths Mar 1922
Clapp, William H B, aged 81, Birkenhead 8a 885
Dawn