First of all, I think your LDS is being ridiculous. The procedure is a relatively minor one, only takes a couple of minutes to do, and would really make the customer happy. If you purchased your MK25 and accessories at the shop, then I think they are being even more ridiculous.
To clarify, you currently have your reg DIN-configured and you'd like to use it with a yoke tank valve. The way I see it, you have 3 options:
- If you're only going to do a few dives with the yoke tank valve, it may not make sense to do the full-blown conversion. You could buy a DIN-to-yoke adapter ($30-$80 new) that would allow you to use your DIN configured reg with yoke tank valves. No tools are needed at all. Just spin the adapter on by hand and connect it to the tank valve. Easy.
- Another option is to do the DIY replacement. To help guide the repair, you should first download the MK25 technician's manual from this site. The DIN connector should be loosened with the appropriate hex key/allen wrench. Make sure that you have installed the appropriate yoke parts in the correct order into the first stage. You should use a torque wrench fitted with a special socket that fits the yoke nut. I do know of some people who have used a giant adjustable crescent wrench instead. If you do this, expect to strip the soft brass nut. You will also likely be way off on the recommended torque specs. I highly recommend that you have the proper tools (torque wrench, special socket, extension) on hand if you take this route.
- Your last option is to be patient and wait until your reg needs to be overhauled. If you provide thadditional charge. No extra labor is involved.
e yoke parts, the reg tech should be able to install them during reg re-assembly for no
Good luck.