That's odd, I've never heard of anyone breaking the thread on a Titan. I have four full size that I've been using more than ten years (Colour coordination is important...) Only thing that happened was the .04" lens cracked - which was gutting when you can't buy them readily in the UK. I did buy one on eBay and the threads were a mess but from user over tightening. Maybe depends how much vibration is coming out of your bow. My bows tend to be quiet and low vibration.
Re the Shrewd pin - it looks nice, I like the adjustable shades (can't run full shades and remain WA legal) but if you want a bright aiming point and are happy with a post style support you can get the big or small
Shibuya pin for 1/3 the price... and those things are bright! Way brighter than you get on the short fibre used with Titan/Shrewd/Spig type pins in almost any light conditions.
A lot of top archers are not using the fibre in the scopes - they're going with the decal/dot on the plain lens. I like the plain dot in good light but with my progressively bad eyesight I find it hard to pick up in lower light.
2p
BR
Stretch