In article ,
wrote:
On Wednesday, 13 May 2020 14:40:35 UTC+1, Jim GM4DHJ ... wrote:
Tried to put a new blade in mine today to cut some decking and couldn't
get it to stay in place...any ideas ? .... looks like a stupid
arrangement ....

Yes, I have an idea. Show us a relevant photo or instruction booklet diagram.

One my saws like that uses an allen keyed screw to hold the blade in place.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle