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Depends on how small you need. If you only need one or two more holes you can always punch it yourself.
edit: Use one of these. https://www.amazon.com/SE-790LP-Leather-Punch-Set/dp/B001F27AMI/ref=pd_lpo_vtph_469_bs_lp_t_1?_encoding=UTF8&psc=1&refRID=XW672TC1CD0QXG4MCF02&dpID=41sUAyxDaEL&preST=_SX300_QL70_&dpSrc=detail
Leather punch. The little piece of removed leather pops out the side.
https://www.amazon.com/SE-790LP-Leather-Punch-Set/dp/B001F27AMI
I'm thinking something other than a drill bit might work better, maybe like some sort of DIY leather punch out of a piece of pipe?
https://www.amazon.com/SE-790LP-Hollow-Leather-Punch/dp/B001F27AMI
Hi! Happy to help!
Yeah for sure you'll have a more durable result if you add a backing layer, especially with a bunch of spikes (DOPE REFERENCE JACKET BTW).
There are a few ways you can do it, but my recommendation would be to cut a piece of leather or pleather the same size as the total area of your spikes (think of it like a big back patch) that will go inside the jacket. This piece will provide an extra layer of stability.
Mark your holes on the jacket (don't punch yet). Then, you can stitch the "patch" inside the jacket. Minimum recommendation would be "tacking" every few inches on each edge if you don't want it to show on the outside.( In a pinch, I absolutely think you could use rubber cement to adhere it though I don't know without a test if you would see it from the outside). Double sided tape (not office supply stuff it's not strong enough, you want body-specific tape) could also be used at minimum in each of the 4 corners. Essentially, you're anchoring the support patch in place so you can punch holes and mount the spikes. An analogy would be like using washers with screws/bolts in carpentry - more surface area in support = lower likelihood of spikes ripping out + adding stability to a large area.
When the support patch is in place, I recommend using a punch like this style found on amazon to make life easier.
*with punching holes, you always want to err on the side of smaller rather than larger as pleather/leather typically has some "give" to it.
You can absolutely use an awl to make your holes. It will be easier to do if your support patch is secured in more places, so it doesn't move around when you're aligning the layers.
I hope this helps, please let me know if you have questions on any of it! Happy spiking!