Can't send the link, but what it was is ---
You cut the plastic back spacer out, install a piece of box section aluminum, bought from Mitre10 fits perfectly - fix in place, with small screws, threw the side of mag.
The spring & platform, can be pushed down and gently levered out, from the top. The bottom of the magazine unclips carefully. Then you are ready to cut the plastic spacer out & install the aluminum section, setting the length you require. Simply clip bottom back in & install spring set again. I increase the ride plate size so as it cradled the length of the 223 case, otherwise there is a gap at the back, which catches the back of the case a bit. JBs Weld is amazing stuff for moulding and sticking things, also have use it to bed actions, glue in pillar beds, all sorts.
I did this some years ago and it worked well, don't own the Tikka light 223 anymore, so some food for thought for those who don't mind tinkering, I did it to a 5 shot mag that was behaving badly as explained in above post.
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