This turnbutton tool is the daddy of them all. No need for a hammer , simply insert your canvas between the forks and squeeze. Couldnt be any simpler. Also, the only tool that you can cut holes with while your canopy is fitted to the boat. 
This is what the professionals use
This turnbutton tool is to be used only with turnbuttons. Will not fit lift the dots
                                                       UK
  UK
 We post everyday with Royal Mail 24. 
Shipping is free for UK customers
 We also can offer to upgrade to 
RM 24 tracked or Next day guaranteed
 Ireland
 Ireland
 DHL Express (Next day - 2 days) if paid before 3pm
 DHL Economy (2 - 4 days) if paid before 3pm
 We may send economy if the weight above 2kg
 EU
 EU
 Royal Mail International Tracked ( 5 - 10 days )
 DHL Express ( Next day to 2 days )