I got an MTL Interactive recently, and wanted to have a crack at getting it open. My cheap GOSO dimple set was still in the mail (thanks a bunch banggood >:/ Stuck in Guangzhou!), and I didn't have any large half diamonds about, so I thought I would try my hand at making a dimple pick. It was a little harder than I had first thought! I didn't find any other designs or plans online, so I had to experiment a little, and hope somebody else might find this useful.
Like a bakers first loaf..

Definitely a little rough.. Putting it mildly. I whipped this up in an half an hour from wiper inserts, a pen casing, and some 4 minute epoxy. It works reasonably well, the shank diameter was good, striking a good balance between thickness and rigidity, but the shank itself didn't set in the centre of the pen case making it turn eccentrically. Originally the hook was a little longer, but I felt it was getting caught up (this was when I first picked on the MTL), so I slowly reduced the size until it became.. too small.
Mark II

With the above in mind, I set about making Mark II. I searched for a better ay to centre the pick to the case, and found that this particular BIC pen has just the right diameter hole to suit my wiper insert on one end. In the larger end I stuffed some bits of paper around the pick to keep it central before topping it off with epoxy again. This pick will definitely come in handy for the future, but I didn't get an open with it, as the shank diameter was this time too small, and twisted easily with rotation torque. I could get some sets with this, but not all, so back to the drawing board it was.
Going off track..

The worst of the bunch. I wanted a thicker shank, but that prevented me from getting a nice tight 90deg bend, so I ended up with this, what I like to call the Golf Club. The part of the 90 closer to the shank interfered with pins I wasn't working on, and to top it off it went soft halfway through the job.. We've all been there.. right fellas? Huh, Huh? I had used heat to try and tighten the bend, and the spring steel didn't seem to take well, and lost its spring. I tried heating to cherry red, and cooling with oil, and water and mild hot and oil and water, but nothing seemed to get it springy again. If anyone has some tips on this, or a good method, please let me know below!
Success!

Finally! Success! This pick proved to be just right. Right shank diameter, good 90deg bend, and a sturdy, but soft rubber handle. Have to admit, I cheated a little on this one, by peeking at a picture of one of the picks from the Souber MTL Pickset, something I probably should have done from the start. I also made a Mark 3.5 pick before I got to this one, but it didn't get photographed as being borked, it is currently residing at the bottom of the bin in my shed. To make the one above, I reduced the shank of the wiper insert, and then put a 90deg forced bend into it, ie no heat. On the 3.5 I silver soldered another piece of insert onto the shank to make the 90. Needless to say, it kept breaking at the weld, despite numerous repairs using different soldering methods.
I'm pretty happy with the result as it gave me my first open on an MTL Interactive! Hope somebody finds the info useful, please feel to chime in with hints and suggestions.
adi_picker