I just went through a Bally rectifier board set of connectors that someone in the past didn't use a proper crimping tool. The connector pins were the trifurcon, but the crimps were crap and dangerous. The poor connection at the crimps caused heat build up, burned up a connector and could have caused a fire.
When removing the pins from the connector housing, the wires easily pulled out of the connector less the pin.
Going the direction of attempting to crimp without a proper tool -- you likely will make the connector problem worse, dangerous and maybe burn your house down to avoid the expense of a crimping tool.
Always use the proper tool for the job. If it doesn't fit, use a bigger hammer.